This section of the FEDERAL REGISTER
contains notices to the public of the proposedissuance of rules and regulations. Thepurpose of these notices is to give interestedpersons an opportunity to participate in therule making prior to the adoption of the finalrules.Proposed RulesFederal Register59042 
Vol. 86, No. 204 
Tuesday, October 26, 2021 
DEPARTMENT OF ENERGY 
10 CFR Part 460 
[EERE–2009–BT–BC–0021] 
RIN 1904–AC11 
Energy Conservation Program: Energy 
Conservation Standards for Manufactured Housing: Availability of Provisional Analysis 
AGENCY : Office of Energy Efficiency and 
Renewable Energy, Department of Energy. 
ACTION : Supplemental notice of 
proposed rulemaking; reopening of public comment period and notification of data availability (NODA). 
SUMMARY : The U.S. Department of 
Energy (DOE) is reopening the public comment period for the supplemental notice of proposed rulemaking (‘‘SNOPR’’) regarding proposals to amend energy conservation standards for manufactured housing. DOE published the SNOPR in the Federal 
Register on August 26, 2021. DOE is 
also publishing a notice of data availability (NODA) for the manufactured housing energy conservation standards rulemaking announcing the availability of updated analyses and results, and is giving interested parties an opportunity to comment on these analyses and submit additional data. 
DATES : The comment period for the 
SNOPR which published on August 26, 2021 (86 FR 47744), is reopened. DOE will accept comments, data, and information regarding the SNOPR and NODA received no later than November 26, 2021. See section IX, ‘‘Public Participation,’’ for details. 
ADDRESSES : Any comments submitted 
must identify the NODA for Energy Conservation Standards for Manufactured Housing and provide docket number EERE–2009–BT–STD– 0021 and/or regulatory information number (RIN) number 1904–AC11. Submit electronic comments in WordPerfect, Microsoft Word, PDF, or ASCII file format, and avoid the use of special characters or any form of encryption. 
Although DOE has routinely accepted 
public comment submissions through a variety of mechanisms, including postal mail and hand delivery/courier, the Department has found it necessary to make temporary modifications to the comment submission process in light of the ongoing Covid–19 pandemic. DOE is currently suspending receipt of public comments via postal mail and hand delivery/courier. If a commenter finds that this change poses an undue hardship, please contact Appliance Standards Program staff at (202) 586– 1445 to discuss the need for alternative arrangements. Once the Covid–19 pandemic health emergency is resolved, DOE anticipates resuming all of its regular options for public comment submission, including postal mail and hand delivery/courier. 
No telefacsimilies (faxes) will be 
accepted. For detailed instructions on submitting comments and additional information on the rulemaking process, see section IX.A of this document. 
Docket: The docket for this activity, 
which includes Federal Register notices, comments, and other supporting documents/materials, is available for review at www.regulations.gov. All documents in 
the docket are listed in the www.regulations.gov index. However, 
not all documents listed in the index may be publicly available, such as information that is exempt from public disclosure. 
The docket web page can be found at 
www.regulations.gov/docket?D=EERE- 2009-BT-BC-0021. The docket web page 
contains instructions on how to access all documents, including public comments, in the docket. See section IX.A for information on how to submit comments through www.regulations.gov. 
FOR FURTHER INFORMATION CONTACT : Mr. 
John Cymbalsky, U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Building Technologies Program (EE–2J), 1000 Independence Avenue SW, Washington, DC 20585; 202–287–1692; john.cymbalsky@ee.doe.gov. 
Mr. Matthew Ring, U.S. Department of 
Energy, Office of the General Counsel (GC–33), 1000 Independence Avenue SW, Washington, DC 20585; 202–586– 2555; matthew.ring@hq.doe.gov. 
SUPPLEMENTARY INFORMATION : 
Table of Contents 
I. Background 
II. Summary of the Analyses Performed by 
the Department of Energy 
III. Summary of the Updated Inputs Since the 
August 2021 MH SNOPR 
A. 2021 CFPB Manufactured Housing 
Finance Report 
B. 2020 Manufactured Housing Survey C. AEO 2021 D. 2020 Shipments 
IV. Summary of Updated SNOPR Analysis 
Results 
V. Sensitivity Analysis Results—Alternate 
Size-Based Tier Threshold For the Tiered Standard 
VI. Sensitivity Analysis Results—Alternate 
R–21 Exterior Wall Insulation for Climate Zone 2 and 3 for Tier 2 and Untiered Standards 
A. Sensitivity Analysis Results—Alternate 
R–21 Exterior Wall Insulation for Climate Zone 2 and 3 Combined With Alternate Size-Based Tier Threshold for Tiered Standard 
VII. Comparison of the August 2021 MH 
SNOPR and NODA Results 
VIII. Reopening of Comment Period IX. Public Participation 
A. Submission of Comments 
X. Approval of the Office of the Secretary 
I. Background 
DOE published a supplemental notice 
of proposed rulemaking (‘‘SNOPR’’) 
proposing amended energy conservation standards for manufactured housing on August 26, 2021 (‘‘August 2021 MH SNOPR’’). 86 FR 47744. In the August 2021 MH SNOPR, DOE’s primary proposal was the ‘‘tiered’’ approach, based on the 2021 IECC, wherein a subset of the energy conservation standards would be less stringent for certain manufactured homes in light of the cost-effectiveness considerations required by statute. Under the tiered proposal, two sets of standards would be established in proposed 10 CFR part 460, subpart B (i.e., Tier 1 and Tier 2). 
Tier 1 would apply to manufactured homes with a manufacturer’s retail list price of $55,000 or less, and also incorporate building thermal envelope measures based on certain thermal envelope components subject to the 2021 IECC, but would limit the incremental purchase price increase to an average of approximately $750. Tier 2 would apply to manufactured homes with a manufacturer’s retail list price 
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1In the August 2021 SNOPR, DOE performed LCC 
analyses for a 30-year period, based on the assumed 
lifetime of manufactured homes. 86 FR 87744, 87791–87792. Additionally, based on comments received, to measure the LCC of the first homeowner of a manufactured home, DOE also performed LCC analyses for a 10-year period. Id. Analyses for both a 30-year and 10-year period are presented in this NODA. above $55,000, and incorporate building 
thermal envelope measures based on certain thermal envelope components and specifications of the 2021 IECC (i.e., the Tier 2 requirements would be the same as those under the proposed single, ‘‘untiered’’ set of standards). 86 FR 47744, 47746. 
As noted in the August 2021 MH 
SNOPR, several data sources that served as inputs to the August 2021 MH SNOPR have since been updated to include more recent data that DOE did not incorporate in its analyses in the August 2021 MH SNOPR. 86 FR 47758. DOE sought comment on the use of these data sources for this rulemaking. Further, based on comments and consultations with the U.S. Department of Housing and Urban Development (HUD), DOE conducted a sensitivity analysis using an alternate tier threshold based on size (e.g., single-section vs. 
multi-section homes) for the tiered proposal. DOE also performed a sensitivity analysis with alternate wall insulation requirements for climate zones 2 and 3 for both the tiered and the untiered standards. This notice of data availability (NODA) announces the availability of these updated inputs and corresponding analyses results and invites interested parties to submit comments on these analyses or provide any additional data. DOE will consider the updated inputs and corresponding analyses, as well comments on the inputs and analyses, as part of this rulemaking. DOE may further revise the analysis presented in this rulemaking based on any new or updated 
information or data it obtains. DOE encourages stakeholders to provide any additional data or information that may inform the analysis. 
II. Summary of the Analyses Performed 
by the Department of Energy 
DOE conducted analyses of 
manufactured housing for both the August 2021 MH SNOPR and this 
NODA in the following areas: (1) Life- cycle cost (‘‘LCC’’) and payback period (‘‘PBP’’), (2) national impacts, and (3) emissions impacts. 
DOE conducts LCC and PBP analyses 
to evaluate the economic impacts on individual consumers of energy conservation standards for manufactured housing. The LCC is the total consumer expense of a manufactured home over the life of that home, consisting of total installed cost plus total operating costs. To compute the total operating costs, DOE discounts future operating costs to the time of purchase and sums them over the lifetime of the product (or another specified period).
1The PBP is the 
estimated amount of time (in years) it takes consumers to recover the increased purchase cost of a more- efficient manufactured home through lower operating costs. 
DOE conducts the national impact 
analysis (‘‘NIA’’) to assess the national energy savings (‘‘NES’’) and the national net present value (‘‘NPV’’) from a national perspective of total consumer costs and savings that would be expected to result from new or amended standards. DOE calculates the NES and NPV based on projections of annual product shipments, along with the annual energy consumption and total incremental cost data from the LCC analyses. 
Finally, DOE estimates environmental 
benefits in the form of reduced emissions of air pollutants and greenhouse gases associated with electricity production. DOE bases these estimates on a 30-year analysis period of manufactured home shipments and includes the reductions in emissions that accrue over the 30-year home lifetime. DOE’s analysis estimates 
reductions in emissions of six pollutants associated with energy savings: Carbon dioxide (CO
2), mercury (Hg), nitric oxide and nitrogen dioxide (NO X), 
sulfur dioxide (SO 2), methane (CH 4), 
and nitrous oxide (N 2O). These 
reductions are referred to as ‘‘site’’ 
emissions reductions. Furthermore, DOE estimates reductions due to ‘‘upstream’’ activities in the fuel production chain. These upstream activities comprise extraction, processing, and transporting fuels to the site of combustion. Together, site emissions reductions and upstream emissions reductions account for the FFC. Further, DOE calculates the value of the reduced emissions of CO
2, CH 4, 
and N 2O (collectively, greenhouse gases 
or GHGs) using a range of values per 
metric ton of pollutant, consistent with the interim estimates issued in February 2021 under Executive Order 13990. Separately, DOE also estimates the monetary benefits from the reduced emissions of NO
Xand SO 2. 
III. Summary of the Updated Inputs Since the August 2021 MH SNOPR 
As noted in the August 2021 MH 
SNOPR, several data sources that served as inputs to the August 2021 MH SNOPR have since been updated to include more recent data that DOE did not incorporate in its analyses in the August 2021 MH SNOPR. 86 FR 47758. Table III.1 presents a summary of the updated inputs and the analyses that are impacted because of the updates to the data. DOE will consider the updated inputs and corresponding analyses, as well comments on the inputs and analyses, as part of this rulemaking. DOE may further revise the analysis presented in this rulemaking based on any new or updated information or data it obtains. DOE encourages stakeholders to provide any additional data or information that may inform the analysis. 
TABLE III.1—U PDATED INPUTS TO THE ANALYSIS CONDUCTED FOR THE ENERGY CONSERVATION STANDARDS  
SNOPR NODA Analyses impacted 
2014 Consumer Finance Protection Bureau 
(CFPB) Manufactured Housing Finance Re-
port.2021 CFPB Manufactured Housing Finance 
Report.Impacts the LCC, PBP and NIA analyses. 
2019 Manufactured Housing Survey (MHS) ...... 2020 MHS ........................................................ Determines the manufacturer’s retail list price 
threshold for the tiered proposal, and af-fects shipments for NIA and emissions anal-yses. 
Annual Energy Outlook (AEO) 2020 ................. AEO 2021 ......................................................... Impacts the LCC, PBP, NIA and emissions 
analyses. 
2019 Shipments ................................................. 2020 Shipments ............................................... Impacts the NIA and emissions analyses. 
2015 Energy Star Shipments ............................. 2020 Energy Star Shipments.
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2Manufactured Housing Finance: New Insights 
from the Home Mortgage Disclosure Act; https://
www.consumerfinance.gov/data-research/research- 
reports/manufactured-housing-finance-new- insights-hmda/. 
3CFPB report, 2014. https://files.consumer
finance.gov/f/201409 _cfpb_ report_ manufactured- 
housing.pdf. 4Manufactured Housing Survey, Public Use File 
(PUF) 2019. https://www.census.gov/data/datasets/ 
2019/econ/mhs/puf.html. 
5The Consumer Finance Protection Bureau 
(CFPB) generally describes a higher-priced mortgage loan as a loan with an annual percentage rate, or APR, higher than a benchmark rate called the Average Prime Offer Rate. The requirements for this 
loan can be found in 12 CFR 1026.35. 
62014 CFPB MH report; See page 6. 7Manufactured Housing Survey; 
www.census.gov/programs-surveys/mhs.html. 
8Manufactured Housing Survey, Public Use File 
(PUF) 2020. https://www.census.gov/data/datasets/ 
2020/econ/mhs/puf.html. 
9Manufactured Housing Survey, Annual Tables 
of New Manufactured Homes: 2014–2020; https:// 
www.census.gov/data/tables/time-series/econ/mhs/ 
annual-data.html. Sections III.A through III.D provide a 
summary of the input updates for this 
NODA. Sections IV through VI provide the LCC, PBP, national and emissions impacts results based on the input updates discussed in this section. 
A. 2021 CFPB Manufactured Housing 
Finance Report 
The CFPB manufactured housing 
(‘‘MH’’) report analyzes the differences between mortgage loans used for site- built homes, and mortgage loans and chattel loans used for manufactured homes.
2For the August 2021 MH 
SNOPR, the proposed manufacturer’s retail list price tier threshold for the tiered standard was developed using loan data derived from the 2014 CFPB report,
3and purchase price data derived 
from the MHS 2019 Public Use File (‘‘PUF’’) data.
486 FR 47744, 47760. In 
this NODA, DOE maintained the same analysis as the August 2021 MH SNOPR, but updated the CFPB MH report source to the latest version, which is the 2021 CFPB MH report. Section III.B provides the discussion regarding the updated purchase price data using MHS 2020 PUF data. 
To calculate the tier threshold for the 
tiered standard, DOE considered that low-income purchasers of manufactured homes would mostly likely use chattel loans, or similar loans that are high- priced.
5The 2014 CFPB MH report 
explicitly stated that high-priced manufactured housing loans (including chattel loans) account for roughly 68 percent of total manufactured housing 
loans.
6 
The 2021 CFPB MH report no longer 
reports this information. Instead, the 2021 CFPB MH report lists the proportion of loans that are chattel loans, as well as the proportion of chattel and non-chattel loans that are high-priced loans. The 2021 CFPB MH report states that 42 percent of all manufactured home loans are chattel loans; accordingly, DOE determined that the remaining (58 percent) would be non-chattel loans. Of the chattel loans, the 2021 CFPB MH report states that 93.8 percent are high-priced loans. Similarly, of the non-chattel loans, the 2021 CFPB MH report states that 52.4 percent are high-priced loans. Using these data, DOE estimates that approximately 70 percent (42% * 93.8% + 58% * 52.4% = 70%) of all manufactured housing loans (i.e., chattel and non-chattel loans) were high-priced loans. Accordingly, for this NODA, DOE assumed that high-priced manufactured housing loans (including chattel loans) account for roughly 70 percent of total manufactured housing loans. This percentage is used to determine the updated manufacturer’s retail list price tier threshold, which is discussed further in section III.B. 
Additionally, the 2021 CFPB MH 
report also lists the median chattel loan term as 23 years, which differs from the 15-year value that DOE assumed in the 
August 2021 MH SNOPR, which was based on suggestions from the MH working group. 86 FR 47744, 47793. For this NODA, DOE assumes a chattel loan term of 23 years, which is consistent with the 2021 CFPB MH report. The impact of the longer loan on the analysis is that it increased LCC savings and decreased NPV at 3 percent discount rate. 
B. 2020 Manufactured Housing Survey 
The MHS, which is sponsored by 
HUD and collected by the Census 
Bureau, provides data on shipments, prices and characteristics of new manufactured housing.
7Specifically, 
the MHS PUF data provide estimates of average sales prices for new manufactured homes sold or intended for sale by geographical region and size of home. 
As discussed in section III.A, for the 
August 2021 MH SNOPR, the purchase price data used to determine the manufacturer’s retail list price tier threshold was derived from the MHS 2019 PUF data. 86 FR 47744, 47760. In this section, DOE discusses the updates based on the latest MHS data, which is the MHS 2020 PUF data.
8 
The MHS 2020 PUF data set provides 
data that relates Census region (the U.S. Census Bureau divides the country into four census regions) with sales price. Table III.2 summarizes the average, minimum and maximum sales prices based on census region and number of sections. In general, the data indicate that average sales price (specifically for single-section homes) does not differ significantly based on census region. 
TABLE III.2—MHS PUF 2020 C ENSUS REGION AND SALES PRICE DATA 
Census region Single-section sales price 
(2020$) Dual-section sales price* 
(2020$) 
Average Minimum Maximum Average Minimum Maximum 
Northeast .................................................. $57,916 $35,600 $95,000 $107,951 $56,000 $233,000 
Midwest .................................................... 56,983 33,200 79,000 104,987 54,000 184,000 
South ........................................................ 56,798 31,400 79,000 106,942 58,000 170,000 
West ......................................................... 61,748 34,100 117,000 118,282 64,000 236,000 
All ............................................................. 57,233 31,400 117,000 108,583 54,000 236,000 
* The MHS PUF 2020 dataset provides multi-section home sales price separately for dual-section homes and triple-section (or larger) homes; 
however the triple-section (or larger) homes data is not differentiated by census region. Therefore, DOE only presents the dual-section data in 
this table, which should generally represent the sales price for multi-section homes (triple-section or larger represent 1 percent of the market in 2020 based on the MHS PUF 2020 dataset). 
Further, the MHS also summarizes 
average manufactured home sales price by state.9Table III.3 presents the 
average sales prices in 2020 per HUD climate zone based on the MHS data 
discussed previously and manufactured 
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10Manufactured Housing Institute, Annual 
Production and Shipment Data; https://
www.manufacturedhousing.org/annual- production/. 
11DOE considered that a percentage of 
manufactured homes placed/sold would shift to less stringent standards, i.e., a percentage of homes 
from Tier 2 would shift to Tier 1. The inclusion of 
this shift in the market is to more accurately estimate energy savings (and other downstream results). 12Energy Information Administration. Annual 
Energy Outlook 2021 with Projections to 2050. 
(2021). 
13Energy Information Administration. Short- 
Term Energy Outlook: Real Prices Viewer. Available at: www.eia.gov/forecasts/steo/realprices/. home shipments published by 
Manufactured Housing Institute.10 
TABLE III.3—MHS A VERAGE SALES 
PRICE DATA BY HUD C LIMATE ZONE 
HUD 
climate 
zone Single-section 
average sales 
price 
(2020$) Dual-section 
average sales 
price 
(2020$) 
1 ................ $57,124 $107,003 
2 ................ 57,290 111,208 
3 ................ 56,207 109,147 
To determine the updated 
manufacturer’s retail list price tier in a 
similar manner to what was considered in the August 2021 MH SNOPR, DOE assumed that price-sensitive, low- income purchasers rely on high-priced loans, given the inability to qualify for conventional loans. Based on the analysis in section III.A, the 70th percentile manufactured housing price gives an estimate for the upper bound 
for a manufactured home sales price that a price-sensitive low-income purchaser could afford. If people typically receive one primary loan, the percentage of high-priced loans used should be roughly equivalent to the percentage of people receiving high- priced loans (e.g., 70 percent). DOE 
considered that low-income purchasers would mainly purchase single-section homes that are, on average, at a lower sales price than multi-section homes. Applying the 70th percentile for single- section manufactured homes using the 
MHS PUF 2020 data yields a sales price of approximately $63,000 (in real 2020$). 
Using the updated tier threshold at 
$63,000 (in real 2020$) and the MHS 
PUF 2020 data set, DOE determined the shipment breakdown based on tier and climate zone using the same methodology as presented in the August 2021 MH SNOPR. 86 FR 47744, 47809– 
47810. This included applying a ‘‘substitution effect’’
11to 20 percent of 
homes within $1,000 of the price 
threshold ($63,001–$64,000) that would shift to less stringent standards, i.e., from Tier 2 to Tier 1. Id. Accordingly, 
Table III.4 presents the corresponding 
percentage of total manufactured homes placed/sold applicable to each tier based on climate zone and size using the updated inputs. Compared to the August 2021 MH SNOPR, a higher 
percentage of single-section manufactured home shipments are in Tier 1, i.e., Climate zone 1 or 2: 73.85 
percent in this document vs. 53.58 
percent in the August 2021 MH SNOPR; Climate zone 3: 73.28 percent in this document vs. 57.32 percent in the August 2021 MH SNOPR). Further, a portion of multi-section manufactured home shipments will also be in Tier 1. 
TABLE III.4—S HIPMENT BREAKDOWN BASED ON TIER AND PROPOSED CLIMATE ZONE 
Climate zone 1 or 2 Climate zone 3 Combined 
climate zone 
(%) Single-section 
(%) Multi-section 
(%) Single-section 
(%) Multi-section 
(%) 
Tier 1 Standard .................................................................... 74 5 73 3 35 
Tier 2 Standard .................................................................... 26 95 27 97 65 
Total .............................................................................. 100 100 100 100 100 
C. AEO 2021 
The AEO presents long-term annual 
projections of energy supply, demand, 
and prices. The projections, focused on U.S. energy markets, are based on results from DOE Energy Information Administration’s (‘‘EIA’’) National Energy Modeling System (‘‘NEMS’’). NEMS enables EIA to make projections under internally consistent sets of assumptions. DOE used AEO projections as inputs into several 
analyses for the August 2021 MH SNOPR, which are discussed in more 
detail in this section. 
For the August 2021 MH SNOPR, 
DOE used inputs from AEO 2020 for establishing energy prices, escalation rates, inflation rates and housing starts. 86 FR 47744, 47794. In this NODA, DOE maintains the same source as the August 2021 MH SNOPR, but updated the AEO source to the latest version, which is AEO 2021.
12Further, DOE updated the 
electricity prices from the EIA Short- 
Term Energy Outlook.13Specifically, 
DOE used electricity prices from 2020 quarter 2 and quarter 3 for summer electricity prices, and quarter 4 of 2020 and quarter 1 of 2021 for winter electricity prices. Table III.5 presents a comparison of the August 2021 MH SNOPR and NODA fuel prices and escalation rates. 
TABLE III.5—AEO 2021 F UELPRICES AND ESCALATION RATES UPDATES  
SNOPR NODA 
Price Escalation rate 
(%) Price Escalation rate 
(%) 
Electricity: 
Summer ................................................................................ 13.3 cents/kWh ....... 2.3 13.3 cents/kWh .. ..... 2.2 
Winter .................................................................................... 12.9 cents/kWh 13.2 cents/kWh 
Natural gas ................................................................................... 10.3 $/MBtu ............. 2.8 10.1 $/Mbtu ............. 2.8 
Liquid petroleum gas (LPG) ......................................................... 21.6 $/Mbtu ............. 4.1 17.3 $/Mbtu ..... ........ 3.7 
Oil ................................................................................................. 22.8 $/Mbtu ............. 3.3 17.8 $/Mbtu ............. 3.8 
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14See Manufactured Home Shipments by Product 
Mix, 2019, Manufactured Housing Institute. 
www.manufacturedhousing.org/annual- production/. 15See Manufactured Home Shipments by Product 
Mix, 2020, Manufactured Housing Institute. www.manufacturedhousing.org/annual- production/. To forecast the nominal price increase 
of manufactured homes, DOE used the 
inflation forecast rate built into the AEO 2021 at 2.28 percent, compared to the 
August 2021 MH SNOPR inflation based 
on AEO 2020 at 2.33 percent. To 
forecast shipments into the future, DOE used a 5-year-average projection for growth in new housing starts from AEO 2021 resulting in a 0.42 percent growth 
per year compared to the August 2021 MH SNOPR projection for growth based on AEO 2020 at 0.3 percent growth per 
year. 
For the August 2021 MH SNOPR, 
DOE derived annual average site-to- power plant factors based on the version of the NEMS that corresponds to AEO 2020. DOE calculated primary energy savings (power plant consumption) from site electricity savings by applying a factor to account for losses associated with the generation, transmission, and distribution of electricity. DOE computed the full-fuel cycle (‘‘FFC’’) by 
encompassing the energy consumed in extracting, processing, and transporting or distributing primary fuels, which we refer to as ‘‘upstream’’ activities. 86 FR 47744, 47814. In this NODA, DOE updated the same inputs to AEO 2021. Table III.6 presents a comparison of the August 2021 MH SNOPR (based on AEO 2020) and NODA (based on AEO 2021) primary energy and FFC factors. 
TABLE III.6—P RIMARY ENERGY AND FFC F ACTORS , 2020–2050 
Factor type Fuel type Dimensionless factor 
2020 2030 2040 2050 
SNOPR 
Primary .......................... Electricity .............................................................. 2.881 2.669 2.650 2.653 
FFC ............................... Electricity .............................................................. 1.049 1.044 1.044 1.041 
Natural Gas .......................................................... 1.109 1.114 1.112 1.107 
LPG/Oil ................................................................. 1.174 1.172 1.176 1.180 
NODA 
Primary .......................... Electricity .............................................................. 2.845 2.714 2.698 2.677 
FFC ............................... Electricity .............................................................. 1.044 1.039 1.037 1.037 
Natural Gas .......................................................... 1.101 1.098 1.098 1.099 
LPG/Oil ................................................................. 1.169 1.171 1.179 1.185 
For the August 2021 MH SNOPR, 
DOE also used the AEO 2020 to derive 
the power sector marginal emissions intensity factors for CO
2, NO X, SO 2, and 
Hg. 86 FR 47744, 47814. For this NODA, DOE updated the emissions factors to AEO 2021. 
Finally, in the August 2021 MH 
SNOPR, DOE also proposed that under the tiered proposal the manufacturer’s retail list price thresholds would be adjusted for inflation (for the applicable year of compliance) using the most recently available AEO GDP deflator time series, which at the time was AEO 2020. 86 FR 47744, 47761. As such, in 
Table III.7, DOE provides the updated AEO 2021 GDP deflator series. 
TABLE III.7—AEO 2021 GDP 
DEFLATOR  
GDP deflator 
2020 ...................................... 1 
2025 ...................................... 1.0756 
2030 ...................................... 1.2203 
2035 ...................................... 1.3702 
2040 ...................................... 1.5208 
2045 ...................................... 1.7038 
2050 ...................................... 1.9527 D. 2020 Shipments 
The Institute for Building Technology 
and Safety (‘‘IBTS’’) provides yearly shipments of manufactured homes, which is also published by the Manufactured Housing Institute (‘‘MHI’’).
14For the August 2021 MH 
SNOPR, DOE considered the 2019 shipment data provided through MHI as the latest data available at the time of the analysis. 86 FR 47744, 47798. For the August 2021 MH SNOPR, DOE only received historical shipment data of ENERGY STAR certified manufactured homes categorized by state from 2001 to 2015. Chapter 10 of the August 2021 MH SNOPR Technical Support Document (‘‘TSD’’). Further, DOE did not account for ENERGY STAR homes for the no-standard shipments and therefore excluded any ENERGY STAR shipments to avoid overestimating energy savings. 86 FR 47744, 47808. 
In this NODA, DOE updated the 
August 2021 MH SNOPR analysis by considering the 2020 shipment data provided through MHI.
15Further, DOE 
also received updated 2020 ENERGY 
STAR shipment data, albeit not separated by size (i.e., single-section vs. 
multi-section). DOE notes that there are more ENERGY STAR shipments in 2020 than projected in the August 2021 MH SNOPR, which reduces the total number of shipments applicable for the no- standards case and standards case compared to the August 2021 MH SNOPR, in turn reducing the net present value (NPV) for both the untiered and tiered standards. Finally, as discussed in section III.C, DOE also updated the housing starts (shipment growth rate) to be consistent with AEO 2021. Table III.8 and Table III.9 presents the single- section and multi-section manufactured home shipments considered in the August 2021 MH SNOPR and this NODA. 
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TABLE III.8—S INGLE -SECTION MANUFACTURED HOMES SHIPMENTS  
Year No-Standards case Tiered standard Untiered standard 
SNOPR NODA SNOPR NODA SNOPR NODA 
2025 ......................................................... 41,304 36,855 40,610 36,388 40,041 35,642 
2030 ......................................................... 41,923 37,632 41,225 37,155 40,640 36,395 
2035 ......................................................... 42,558 38,429 41,853 37,938 41,255 37,164 
2040 ......................................................... 43,198 39,243 42,481 38,744 41,876 37,950 
2045 ......................................................... 43,853 40,074 43,128 39,565 42,507 38,754 
2050 ......................................................... 44,514 40,927 43,768 40,403 43,153 39,579 
TABLE III.9—M ULTI-SECTION MANUFACTURED HOMES SHIPMENTS  
Year No-Standards case Tiered standard Untiered standard 
SNOPR NODA SNOPR NODA SNOPR NODA 
2025 ......................................................... 48,268 43,045 47,247 42,069 47,247 42,038 
2030 ......................................................... 48,999 43,952 47,961 42,965 47,961 42,924 
2035 ......................................................... 49,738 44,886 48,685 43,869 48,685 43,836 
2040 ......................................................... 50,489 45,836 49,421 44,800 49,421 44,768 
2045 ......................................................... 51,249 46,803 50,163 45,752 50,163 45,710 
2050 ......................................................... 52,019 47,798 50,919 46,727 50,919 46,681 
IV. Summary of Updated SNOPR 
Analysis Results 
This section provides the results for 
the LCC and PBP, NIA and Emissions analyses based on the updates discussed 
in section III. 
TABLE IV.1—A VERAGE MANUFACTURED HOUSING PURCHASE PRICE (ANDPERCENTAGE ) INCREASES UNDER THE TIERED  
STANDARD  
[2020$] 
Tier 1 Tier 2 
Single-section Multi-section Single-section Multi-section 
$ % $ % $ % $ % 
Climate Zone 1 .................. $627 1.2 $897 0.9 $2,567 4.8 $4,131 4.0 
Climate Zone 2 .................. 627 1.2 897 0.9 4,806 9.0 6,149 5.9 
Climate Zone 3 .................. 719 1.4 700 0.7 4,645 8.7 5,822 5.6 
National Average ....... 660 1.2 839 0.8 3,902 7.3 5,267 5.1 
TABLE IV.2—A VERAGE MANUFACTURED HOUSING PURCHASE PRICE (ANDPERCENTAGE ) INCREASES UNDER UNTIERED  
STANDARD  
[2020$] 
Untiered 
Single-section Multi-section 
$ % $ % 
Climate Zone 1 ................................................................................................ $2,567 4.8 $4,131  4.0 
Climate Zone 2 ................................................................................................ 4,806 9.0 6,149 5.9 
Climate Zone 3 ................................................................................................ 4,645 8.7 5,822 5.6 
National Average ...................................................................................... 3,902 7.3 5,267 5.1 
TABLE IV.3—A VERAGE MANUFACTURED HOME LCC S AVINGS (30 Y EARS ) UNDER THE TIERED STANDARD BY CLIMATE  
ZONE 
[2020$] * 
Tier 1 Tier 2 
Single-section Multi-section Single-section Multi-section 
Climate Zone 1 ................................................................................................ $1,042 $1,601 $2, 427 $3,844 
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I I 59048 Federal Register / Vol. 86, No. 204 / Tuesday, October 26, 2021 / Proposed Rules 
TABLE IV.3—A VERAGE MANUFACTURED HOME LCC S AVINGS (30 Y EARS ) UNDER THE TIERED STANDARD BY CLIMATE  
ZONE—Continued 
[2020$] * 
Tier 1 Tier 2 
Single-section Multi-section Single-section Multi-section 
Climate Zone 2 ................................................................................................ 1,143 1,705 1,156  1,983 
Climate Zone 3 ................................................................................................ 2,560 3,550 2,311  3,056 
National Average ...................................................................................... 1,606 2,205 2,045 3,023 
* No cities exhibit negative LCC savings in Tier 1. San Francisco is the only city that exhibits negative LCC savings in Tier 2.  
TABLE IV.4—A VERAGE MANUFACTURED HOME LCC S AVINGS (30 Y EARS ) UNDER THE TIERED STANDARD BY CLIMATE  
ZONE 
[2020$] * 
Climate zone City Tier 1 Tier 2 
Single-section Multi-section Single-section Multi-section 
1 .................. Miami ...................................................................................... $460 $850 $1,345 $2,336 
1 .................. Houston .................................................................................. 931 1,541 2,231 3,747 
1 .................. Atlanta .................................................................................... 1,532 2,481 3,258  5,468 
1 .................. Charleston .............................................................................. 1,093 1,773 2,494 4, 176 
1 .................. Jackson .................................................................................. 1,312 2,104 2,989 4,968 
1 .................. Birmingham ............................................................................ 1,317 2,101 2,895 4,806 
2 .................. Phoenix .................................................................................. 616 1,026 665 1,763  
2 .................. Memphis ................................................................................. 1,493 2,364 1,491 2, 743 
2 .................. El Paso ................................................................................... 990 1,547 1,106 2, 185 
2 .................. San Francisco ........................................................................ 543 812 (387) (68) 
2 .................. Albuquerque ........................................................................... 1,089 1,719 1,074 2,09 6 
3 .................. Baltimore ................................................................................ 2,422 3,678 2,002 3,164 
3 .................. Salem ..................................................................................... 1,475 2,191 411 82 2 
3 .................. Chicago .................................................................................. 2,443 3,738 2,018 3,239 
3 .................. Boise ...................................................................................... 1,682 2,562 890 1 ,558 
3 .................. Burlington ............................................................................... 2,503 3,798 2,193 3 ,439 
3 .................. Helena .................................................................................... 2,441 3,631 2,431 3,631 
3 .................. Duluth ..................................................................................... 3,917 5,794 5,013 7,256 
3 .................. Fairbanks ................................................................................ 5,851 8,516 9,307 13,065 
National Average .................................................................... 1,606 2,205 2,045 3,023 
* Negative values in parenthesis. 
TABLE IV.5—A VERAGE MANUFACTURED HOME LCC S AVINGS (30 Y EARS ) UNDER THE UNTIERED STANDARD BY CLIMATE  
ZONE 
[2020$] * 
Single-section Multi-section 
Climate Zone 1 ................................................................................................................. ....................................... $2,154 $3,409 
Climate Zone 2 ................................................................................................................. ....................................... 863 1,573 
Climate Zone 3 ................................................................................................................. ....................................... 1,942 2,583 
National Average ............................................................................................................... ............................... 1,733 2,585 
* San Francisco is the only city that exhibits negative LCC savings in the untiered standard results. 
TABLE IV.6—A VERAGE MANUFACTURED HOME LCC S AVINGS (30 Y EARS ) UNDER THE UNTIERED STANDARD BY CLIMATE  
ZONE 
[2020$] * 
Climate zone City Single-section Multi-section 
1 .................. Miami ....................................................................................................... ....................................... $1,142 $1,998 
1 .................. Houston ..................................................................................................... ..................................... 1,971 3,318 
1 .................. Atlanta ..................................................................................................... ....................................... 2,931 4,928 
1 .................. Charleston .................................................................................................. .................................... 2,217 3,719 
1 .................. Jackson ..................................................................................................... ..................................... 2,680 4,459 
1 .................. Birmingham .................................................................................................. .................................. 2,592 4,308 
2 .................. Phoenix ..................................................................................................... ..................................... 403 1,368 
2 .................. Memphis ..................................................................................................... .................................... 1,176 2,286 
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TABLE IV.6—A VERAGE MANUFACTURED HOME LCC S AVINGS (30 Y EARS ) UNDER THE UNTIERED STANDARD BY CLIMATE  
ZONE—Continued 
[2020$] * 
Climate zone City Single-section Multi-section 
2 .................. El Paso ..................................................................................................... ...................................... 817 1,766 
2 .................. San Francisco ............................................................................................... ................................. (585) (349) 
2 .................. Albuquerque ................................................................................................. .................................. 781 1,674 
3 .................. Baltimore ................................................................................................... ..................................... 1,662 2,696 
3 .................. Salem ....................................................................................................... ...................................... 167 495 
3 .................. Chicago ..................................................................................................... ..................................... 1,667 2,751 
3 .................. Boise ....................................................................................................... ....................................... 614 1,183 
3 .................. Burlington .................................................................................................. ..................................... 1,822 2,929 
3 .................. Helena ...................................................................................................... ...................................... 2,053 3,118 
3 .................. Duluth ...................................................................................................... ....................................... 4,462 6,501 
3 .................. Fairbanks ................................................................................................... ..................................... 8,478 11,933 
National Average ............................................................................................................... ............. 1,733 2,585 
* Negative values in parenthesis. 
TABLE IV.7—A VERAGE MANUFACTURED HOME SIMPLE PAYBACK PERIOD UNDER THE TIERED STANDARD BY CLIMATE  
ZONE 
Tier 1 Tier 2 
Single-section Multi-section Single-section Multi-section 
Climate Zone 1 ................................................................................................ 4.7 4.5 8.5 8.5 
Climate Zone 2 ................................................................................................ 4.5 4.4 13.3 12.5 
Climate Zone 3 ................................................................................................ 2.9 2.1 11.5 11.3 
National Average ...................................................................................... 3.7 3.5 11.0 10.6 
TABLE IV.8—A VERAGE MANUFACTURED HOME SIMPLE PAYBACK PERIOD UNDER THE TIERED STANDARD BY CLIMATE  
ZONE 
Climate zone City Tier 1 Tier 2 
Single-section Multi-section Single-section Multi-section 
1 .................. Miami ...................................................................................... 7.4 6.5 10.8 10.5  
1 .................. Houston .................................................................................. 5.1 4.6 8.8 8.6 
1 .................. Atlanta .................................................................................... 3.7 3.3 7.3 7.1 
1 .................. Charleston .............................................................................. 4.6 4.2 8.4 8.2 
1 .................. Jackson .................................................................................. 4.1 3.8 7.6 7.5 
1 .................. Birmingham ............................................................................ 4.1 3.8 7.8 7.6 
2 .................. Phoenix .................................................................................. 6.5 6.0 14.5 12.9 
2 .................. Memphis ................................................................................. 3.7 3.5 12.6 11.4 
2 .................. El Paso ................................................................................... 4.9 4.6 13.3 12.1 
2 .................. San Francisco ........................................................................ 7.2 7.0 18.5 17.1 
2 .................. Albuquerque ........................................................................... 4.8 4.5 13.9 12.7 
3 .................. Baltimore ................................................................................ 2.9 2.0 11.5 10.7 
3 .................. Salem ..................................................................................... 4.3 3.2 15.8 15.1 
3 .................. Chicago .................................................................................. 3.0 2.1 12.1 11.2 
3 .................. Boise ...................................................................................... 3.9 2.8 14.4 13.6  
3 .................. Burlington ............................................................................... 3.0 2.1 12.2 11.3 
3 .................. Helena .................................................................................... 3.0 2.1 11.4 10.7 
3 .................. Duluth ..................................................................................... 2.0 1.4 8.4 7.8 
3 .................. Fairbanks ............................................................................... 1.4 1.0 5.7 5.3 
National Average ................................................................... 3.7 3.5 11.0 10.6 
TABLE IV.9—A VERAGE MANUFACTURED HOME SIMPLE PAYBACK PERIOD UNDER THE UNTIERED STANDARD BY CLIMATE  
ZONE 
Single-section Multi-section 
Climate Zone 1 ................................................................................................................. ....................................... 8.5 8.5 
Climate Zone 2 ................................................................................................................. ....................................... 13.3 12.5 
Climate Zone 3 ................................................................................................................. ....................................... 11.5 11.3 
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TABLE IV.9—A VERAGE MANUFACTURED HOME SIMPLE PAYBACK PERIOD UNDER THE UNTIERED STANDARD BY CLIMATE  
ZONE—Continued 
Single-section Multi-section 
National Average ............................................................................................................... ............................... 11.0 10.6 
TABLE IV.10—A VERAGE MANUFACTURED HOME SIMPLE PAYBACK PERIOD UNDER THE UNTIERED STANDARD BY CLIMATE  
ZONE 
Climate zone City Single-section Multi-section 
1 Miami ........................................................................................................................ ...................... 10.8 10.5 
1 Houston ...................................................................................................................... .................... 8.8 8.6 
1 Atlanta ...................................................................................................................... ...................... 7.3 7.1 
1 Charleston ................................................................................................................... ................... 8.4 8.2 
1 Jackson ...................................................................................................................... .................... 7.6 7.5 
1 Birmingham ................................................................................................................... ................. 7.8 7.6 
2 Phoenix ...................................................................................................................... .................... 14.5 12.9 
2 Memphis ...................................................................................................................... ................... 12.6 11.4 
2 El Paso ...................................................................................................................... ..................... 13.3 12.1 
2 San Francisco ................................................................................................................ ................ 18.5 17.1 
2 Albuquerque .................................................................................................................. ................. 13.9 12.7 
3 Baltimore .................................................................................................................... .................... 11.5 10.7 
3 Salem ........................................................................................................................ ..................... 15.8 15.1 
3 Chicago ...................................................................................................................... .................... 12.1 11.2 
3 Boise ........................................................................................................................ ...................... 14.4 13.6 
3 Burlington ................................................................................................................... .................... 12.2 11.3 
3 Helena ....................................................................................................................... ..................... 11.4 10.7 
3 Duluth ....................................................................................................................... ...................... 8.4 7.8 
3 Fairbanks .................................................................................................................... .................... 5.7 5.3 
National Average ............................................................................................................... ............. 11.0 10.6 
TABLE IV.11—N ATIONAL AVERAGE PER-HOME COSTSAVINGS * 
Single-section Multi-section 
Tier 1 Standard 
Lifecycle Cost Savings (30-Year Lifetime) ...................................................................................... ........................ $1,606 $2,205 
Lifecycle Cost Savings (10-Year Lifetime) ...................................................................................... ........................ $726 $1,015 
Annual Energy Cost Savings in 2020$ ............................................................................................ ....................... $176 $238 
Simple Payback Period .......................................................................................................... ................................. 3.7 3.5 
Tier 2 Standard 
Lifecycle Cost Savings (30-Year Lifetime) ...................................................................................... ........................ $2,045 $3,023 
Lifecycle Cost Savings (10-Year Lifetime) ...................................................................................... ........................ $78 $235 
Annual Energy Cost Savings in 2020$ ............................................................................................ ....................... $354 $496 
Simple Payback Period .......................................................................................................... ................................. 11.0 10.6 
Untiered Standard 
Lifecycle Cost Savings (30-Year Lifetime) ...................................................................................... ........................ $1,733 $2,585 
Lifecycle Cost Savings (10-Year Lifetime) ...................................................................................... ........................ ($57) $50 
Annual Energy Cost Savings in 2020$ ............................................................................................ ....................... $354 $496 
Simple Payback Period .......................................................................................................... ................................. 11.0 10.6 
* Negative values in parenthesis. 
TABLE IV.12—C UMULATIVE FULL-FUEL-CYCLE NATIONAL ENERGY SAVINGS OF MANUFACTURED HOMES PURCHASED  
2023–2052 WITH A 30-Y EARLIFETIME  
Single-section 
quadrillion Btu 
(quads) Multi-section 
(quads) 
Tiered Standard 
Climate Zone 1 ................................................................................................................. ....................................... 0.163 0.526 
Climate Zone 2 ................................................................................................................. ....................................... 0.139 0.475 
Climate Zone 3 ................................................................................................................. ....................................... 0.274 0.435 
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TABLE IV.12—C UMULATIVE FULL-FUEL-CYCLE NATIONAL ENERGY SAVINGS OF MANUFACTURED HOMES PURCHASED  
2023–2052 WITH A 30-Y EARLIFETIME —Continued 
Single-section 
quadrillion Btu 
(quads) Multi-section 
(quads) 
Total .......................................................................................................................... ........................................ 0.576 1.436 
Untiered Standard 
Climate Zone 1 ................................................................................................................. ....................................... 0.276 0.542 
Climate Zone 2 ................................................................................................................. ....................................... 0.249 0.489 
Climate Zone 3 ................................................................................................................. ....................................... 0.370 0.439 
Total .......................................................................................................................... ........................................ 0.894 1.470 
TABLE IV.13—N ETPRESENT VALUE OF CONSUMER BENEFITS FOR MANUFACTURED HOMES PURCHASED 2023–2052 
WITH A 30-Y EARLIFETIME AT A 7% D ISCOUNT RATE* 
Single-section 
billion 2020$ Multi-section 
billion 2020$ 
Tiered Standard 
Climate Zone 1 ................................................................................................................. ....................................... $0.15 $0.31 
Climate Zone 2 ................................................................................................................. ....................................... 0.08 (0.01) 
Climate Zone 3 ................................................................................................................. ....................................... 0.33 0.18 
Total .......................................................................................................................... ........................................ 0.56 0.48 
Untiered Standard 
Climate Zone 1 ................................................................................................................. ....................................... $0.16 $0.30 
Climate Zone 2 ................................................................................................................. ....................................... (0.06) (0.04) 
Climate Zone 3 ................................................................................................................. ....................................... 0.11 0.16 
Total .......................................................................................................................... ........................................ 0.21 0.42 
* Negative values in parenthesis. 
TABLE IV.14—N ETPRESENT VALUE OF CONSUMER BENEFITS FOR MANUFACTURED HOMES PURCHASED 2023–2052 
WITH A 30-Y EARLIFETIME AT A 3% D ISCOUNT RATE 
Single-section 
billion 2020$ Multi-section 
billion 2020$ 
Tiered Standard 
Climate Zone 1 ................................................................................................................. ....................................... $0.45 $1.15 
Climate Zone 2 ................................................................................................................. ....................................... 0.29 0.45 
Climate Zone 3 ................................................................................................................. ....................................... 0.99 0.86 
Total .......................................................................................................................... ........................................ 1.73 2.47 
Untiered Standard 
Climate Zone 1 ................................................................................................................. ....................................... $0.57 $1.11 
Climate Zone 2 ................................................................................................................. ....................................... 0.09 0.35 
Climate Zone 3 ................................................................................................................. ....................................... 0.62 0.78 
Total .......................................................................................................................... ........................................ 1.28 2.23 
TABLE IV.15—E MISSIONS REDUCTIONS ASSOCIATED WITHMANUFACTURED HOMES PURCHASED 2023–2052 W ITH A 30- 
YEARLIFETIME  
Pollutant Tiered standard Untiered standards 
Single-section Multi-section Single-section Multi-section 
Site Emissions Reductions 
CO 2(million metric tons) ................................................................................. 23.7 55.1 35.7 56.2 
Hg (metric tons) ............................................................................................... 0.037 0.097 0.058 0.0995 
NO X(thousand metric tons) ............................................................................ 12.9 27.5 18.8 28.0 
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TABLE IV.15—E MISSIONS REDUCTIONS ASSOCIATED WITHMANUFACTURED HOMES PURCHASED 2023–2052 W ITH A 30- 
YEARLIFETIME —Continued 
Pollutant Tiered standard Untiered standards 
Single-section Multi-section Single-section Multi-section 
SO2(thousand metric tons) ............................................................................. 8.8 20.9 13.4 21.3 
CH4(thousand metric tons) ............................................................................. 1.28 3.16 1.97 3.24 
N2O (thousand metric tons) ............................................................................. 0.26 0.58 0.383 0.591 
Upstream Emissions Reductions 
CO 2(million metric tons) ................................................................................. 2.4 5.2 3.52 5.3 
Hg (metric tons) ............................................................................................... 1.84E–04 4.52E–0 4 2.84E–04 4.63E–04 
NO X(thousand metric tons) ............................................................................ 30.4 66.6 44.8 68 
SO2(thousand metric tons) ............................................................................. 0.24 0.48 0.343 0.49 
CH4(thousand metric tons) ............................................................................. 155 362 234 370 
N2O (thousand metric tons) ............................................................................. 0.013 0.027 0.019 0.028 
Total Emissions Reductions 
CO 2(million metric tons) ................................................................................. 26.2 60.3 39.3 61.5 
Hg (metric tons) ............................................................................................... 0.037 0.097 0.05 9 0.1 
NO X(thousand metric tons) ............................................................................ 43 94.1 64 96 
SO2(thousand metric tons) ............................................................................. 9.1 21.4 13.7 21.8 
CH4(thousand metric tons) ............................................................................. 156 365 236 373 
N2O (thousand metric tons) ............................................................................. 0.27 0.61 0.40 0.62 
TABLE IV.16—N ETPRESENT VALUE OF MONETIZED BENEFITS FROM GHG ANDEMISSIONS REDUCTIONS  
Discount rate 
% Net present value 
million 2020$ 
Tiered standard Untiered Standard 
Single-section Multi-section Single-section Multi-section 
GHG Reduction (using avg. social costs at 5% discount 
rate) * ................................................................................ 5 254.2 587.8 382.2 600.7 
GHG Reduction (using avg. social costs at 3% discount 
rate) * ................................................................................ 3 1,074.3 2,481.0 1,614.1 2,535.2 
GHG Reduction (using avg. social costs at 2.5% discount 
rate) * ................................................................................ 2.5 1,763.2 4,069.6 2,648.5 4,158.4 
GHG Reduction (using 95th percentile social costs at 3% 
discount rate) * .................................................................. 3 3,229.0 7,454.7 4,850.7 7,617.5 
NO XReduction ** ................................................................. 3 114.5 233.6 165.0 243.1 
7 39.9 81.6 57.5 84.9 
SO2Reduction ** .................................................................. 3 176.2 373.2 257.2 389.0 
7 62.0 132.3 90.8 137.9 
* Estimates of SC-CO 2SC-CH 4, and SC-N 2O are calculated using a range of discount rates for use in regulatory analyses. Three sets of val-
ues are based on the average social costs from the integrated assessment models, at discount rates of 5 percent, 3 percent, and 2.5 percent. 
The fourth set, which represents the 95th percentile of the social cost distributions. calculated using a 3-percent discount rate, is included to rep-resent higher-than-expected impacts from climate change further out in the tails of the social cost distributions. The social cost values are emis-sion year specific. See section IV.D of the August 2021 MH SNOPR for more details. 
** The benefits from NO
Xand SO 2were based on the low estimate monetized value. 
V. Sensitivity Analysis Results— 
Alternate Size-Based Tier Threshold for the Tiered Standard 
For this NODA, DOE also considered 
a sensitivity analysis where the tier threshold for the tiered standard would 
be based on the manufactured home size instead of the manufacturer’s retail list price. Specifically, the Tier 1 standard would apply to all single-section homes, and the Tier 2 standard would apply to all multi-section homes. Table V.1 presents the updated shipments breakdown for this sensitivity analysis using the MHS 2020 PUF data set. 
TABLE V.1—S HIPMENT BREAKDOWN BASED ON TIERUNDER THE ALTERNATE SIZE-BASED THRESHOLD  
All climate zones 
Single-section 
(%) Multi-section 
(%) Total 
(%) 
Tier 1 Standard ................................................................................................................ ............ 100 0 45 
Tier 2 Standard ................................................................................................................ ............ 0 100 55 
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TABLE V.1—S HIPMENT BREAKDOWN BASED ON TIERUNDER THE ALTERNATE SIZE-BASED THRESHOLD —Continued 
All climate zones 
Single-section 
(%) Multi-section 
(%) Total 
(%) 
Total .......................................................................................................................... ............ 100 100 100 
The following tables present the 
results for the NIA and emissions 
analyses results based on the alternate size-based tier threshold for the tiered standard only. DOE notes that the LCC and PBP analyses results presented in section IV for both the tiered and untiered standards would not change for this sensitivity analysis. This is because the LCC and PBP analysis evaluates the economic impacts on individual consumers of energy conservation standards for manufactured housing, not the entire nation. Further, the NIA and emissions results presented in section 
IV for the untiered standard would also not change for this sensitivity analysis because the tier threshold does not apply. 
TABLE V.2—C UMULATIVE FULL-FUEL-CYCLE NATIONAL ENERGY SAVINGS OF MANUFACTURED HOMES PURCHASED 2023– 
2052 W ITH A 30-Y EARLIFETIME UNDER THE ALTERNATE SIZE-BASED THRESHOLD  
Tiered standard 
Single-section 
(quads) Multi-section 
(quads) 
Climate Zone 1 ................................................................................................................. ....................................... 0.123 0.542 
Climate Zone 2 ................................................................................................................. ....................................... 0.100 0.489 
Climate Zone 3 ................................................................................................................. ....................................... 0.239 0.439 
Total .......................................................................................................................... ........................................ 0.462 1.470 
TABLE V.3—N ETPRESENT VALUE OF CONSUMER BENEFITS FOR MANUFACTURED HOMES PURCHASED 2023–2052 W ITH 
A30-Y EARLIFETIME UNDER THE ALTERNATE SIZE-BASED THRESHOLD  
Tiered Standard 
7% discount rate 3% discount rate 
Single-section 
billion 2020$ Multi-section * 
billion 2020$ Single-section 
billion 2020$ Multi-section * 
billion 2020$ 
Climate Zone 1 ................................................................................................ $0.15 $0.31 $0.40  $1.17 
Climate Zone 2 ................................................................................................ 0.13 (0.03) 0.35 0.44 
Climate Zone 3 ................................................................................................ 0.40 0.17 1.10 0.85 
Total .......................................................................................................... 0.68 0.45 1.85 2.46 
* Negative values in parenthesis. 
TABLE V.4—E MISSIONS REDUCTIONS ASSOCIATED FOR MANUFACTURED HOMES PURCHASED 2023–2052 W ITH A 30- 
YEARLIFETIME UNDER THE ALTERNATE SIZE-BASED THRESHOLD  
Tiered Standard 
Pollutant Single-section Multi-section 
Site Emissions Reductions 
CO 2(million metric tons) .......................................................................................................... ............................... 19.5 56.2 
Hg (metric tons) ............................................................................................................... ........................................ 0.0292 0.0995 
NO X(thousand metric tons) ......................................................................................................... ........................... 10.9 28.0 
SO2(thousand metric tons) ......................................................................................................... ............................ 7.2 21.3 
CH4(thousand metric tons) ......................................................................................................... ............................ 1.03 3.24 
N2O (thousand metric tons) ....................................................................................................... .............................. 0.21 0.59 
Upstream Emissions Reductions 
CO 2(million metric tons) .......................................................................................................... ............................... 2.0 5.3 
Hg (metric tons) ............................................................................................................... ........................................ 1.48E–04 4.63E–04 
NO X(thousand metric tons) ......................................................................................................... ........................... 25.4 68.0 
SO2(thousand metric tons) ......................................................................................................... ............................ 0.21 0.49 
CH4(thousand metric tons) ......................................................................................................... ............................ 127 370 
N2O (thousand metric tons) ....................................................................................................... .............................. 0.011 0.028 
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TABLE V.4—E MISSIONS REDUCTIONS ASSOCIATED FOR MANUFACTURED HOMES PURCHASED 2023–2052 W ITH A 30- 
YEARLIFETIME UNDER THE ALTERNATE SIZE-BASED THRESHOLD —Continued 
Tiered Standard 
Pollutant Single-section Multi-section 
Total Emissions Reductions 
CO 2(million metric tons) .......................................................................................................... ............................... 21.5 61.5 
Hg (metric tons) ............................................................................................................... ........................................ 0.029 0.100 
NO X(thousand metric tons) ......................................................................................................... ........................... 36.3 96 
SO2(thousand metric tons) ......................................................................................................... ............................ 7.4 21.8 
CH4(thousand metric tons) ......................................................................................................... ............................ 128 373 
N2O (thousand metric tons) ....................................................................................................... .............................. 0.23 0.62 
TABLE V.5—N ETPRESENT VALUE OF MONETIZED BENEFITS FROM GHG ANDEMISSIONS REDUCTIONS UNDER THE  
ALTERNATE SIZE-BASED THRESHOLD  
Tiered standard 
Monetary benefits Discount rate 
% Net present value 
million 2020$ 
Single-section Multi-section 
GHG Reduction (using avg. social costs at 5% discount rate) * ................................................. 5 208.5 600.7 
GHG Reduction (using avg. social costs at 3% discount rate) * ................................................. 3 881.3 2,535.2 
GHG Reduction (using avg. social costs at 2.5% discount rate) * .............................................. 2.5 1,446.6 4,158.4  
GHG Reduction (using 95th percentile social costs at 3% discount rate) * ................................ 3 2,648.9 7,617.5 
NO XReduction ** .................................................................................................................... ..... 3 96.4 243.1 
7 33.5 84.9 
SO2Reduction ** .................................................................................................................... ..... 3 147.2 389.0 
7 51.7 137.9 
* Estimates of SC-CO 2SC-CH 4, and SC-N 2O are calculated using a range of discount rates for use in regulatory analyses. Three sets of val-
ues are based on the average social costs from the integrated assessment models, at discount rates of 5 percent, 3 percent, and 2.5 percent. 
The fourth set, which represents the 95th percentile of the social cost distributions calculated using a 3-percent discount rate, is included to rep-resent higher-than-expected impacts from climate change further out in the tails of the social cost distributions. The social cost values are emis-sion year specific. See section IV.D of the August 2021 MH SNOPR for more details. 
** The benefits from NO
Xand SO 2were based on the low estimate monetized value. 
VI. Sensitivity Analysis Results— 
Alternate R–21 Exterior Wall Insulation for Climate Zone 2 and 3 for Tier 2 and 
Untiered Standards 
For this NODA, DOE also conducted 
a sensitivity analysis using less stringent measures for exterior wall insulation for the Tier 2 and untiered standards. Specifically, the component requirements proposed in the August 2021 MH SNOPR for the prescriptive path for Climate Zone 2 and 3 require that exterior walls be sealed using R– 20+5 exterior wall insulation. DOE proposed this requirement based on the 2021 IECC without modification. The 
‘‘+5’’ involves using ‘‘continuous insulation,’’ which is insulation that runs continuously over structural members and is free of significant thermal bridging. DOE’s proposal requires continuous insulation only for the exterior wall insulation component. 86 FR 47744, 47772. 
Accordingly, in this NODA, DOE 
considered a sensitivity analysis wherein DOE analyzed a less stringent exterior wall insulation requirement for the Tier 2/untiered standard instead. In this sensitivity analysis, DOE considered an R–21 exterior wall insulation as opposed to the proposed R–20+5, which would require continuous insulation. At R–20+5, the incremental cost relative to the baseline is $2,500, versus $850 for R–21. For this analysis, DOE maintained the NODA- updated manufacturer tier threshold (at $60,000 in real 2020$) for the tiered 
standard. 
The following tables present the 
results based on the alternate wall insulation for climate zone 2 and 3 for the Tier 2 and untiered standards only. DOE notes that the Tier 1 results presented in section IV would not change for this sensitivity analysis. 
TABLE VI.1—A VERAGE MANUFACTURED HOUSING PURCHASE PRICE (ANDPERCENTAGE ) INCREASES UNDER TIER2 OF 
THETIERED STANDARD AND THE UNTIERED STANDARD  
[2020$] 
Tier 2/untiered 
Single-section Multi-section 
$ % $ % 
Climate Zone 1 ................................................................................................ $2,567 4.8 $4,131  4.0 
Climate Zone 2 ................................................................................................ 3,082 5.8 4,438 4.3 
Climate Zone 3 ................................................................................................ 2,921 5.5 4,111 4.0 
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TABLE VI.1—A VERAGE MANUFACTURED HOUSING PURCHASE PRICE (ANDPERCENTAGE ) INCREASES UNDER TIER2 OF 
THETIERED STANDARD AND THE UNTIERED STANDARD —Continued 
[2020$] 
Tier 2/untiered 
Single-section Multi-section 
$ % $ % 
National Average ...................................................................................... 2,830 5.3 4,222 4.1 
TABLE VI.2—A VERAGE MANUFACTURED HOME LCC S AVINGS (30 Y EARS ) BYCLIMATE ZONE 
[2020$] * 
Tier 2 standard Untiered standard 
Single-section Multi-section Single-section Multi-section 
Climate Zone 1 ................................................................................................ $2,427 $3,844 $2, 154 $3,409 
Climate Zone 2 ................................................................................................ 2,401 3,238 2,105  2,826 
Climate Zone 3 ................................................................................................ 3,333 4,101 2,977  3,639 
National Average ...................................................................................... 2,740 3,727 2,432 3,291 
* No cities exhibit negative LCC savings in Tier 1 or Tier 2. 
TABLE VI.3—A VERAGE MANUFACTURED HOME LCC S AVINGS (30 Y EARS ) BYCLIMATE ZONE 
[2020$] 
Climate zone City Tier 2 standard Untiered standard 
Single-section Multi-section Single-section Multi-section 
1 .................. Miami ...................................................................................... $1,345 $2,336 $1, 142 $1,998 
1 .................. Houston .................................................................................. 2,231 3,747 1,971 3,318 
1 .................. Atlanta .................................................................................... 3,258 5,468 2,931  4,928 
1 .................. Charleston .............................................................................. 2,494 4,176 2,217 3, 719 
1 .................. Jackson .................................................................................. 2,989 4,968 2,680 4,459 
1 .................. Birmingham ............................................................................ 2,895 4,806 2,592 4,308 
2 .................. Phoenix .................................................................................. 1,987 3,076 1,718 2,674 
2 .................. Memphis ................................................................................. 2,718 3,967 2,402 3, 508 
2 .................. El Paso ................................................................................... 2,353 3,431 2,061 3,008 
2 .................. San Francisco ........................................................................ 951 1,274 745 985 
2 .................. Albuquerque ........................................................................... 2,306 3,325 2,012 2,90 2 
3 .................. Baltimore ................................................................................ 3,053 4,211 2,723 3,752 
3 .................. Salem ..................................................................................... 1,582 1,992 1,341 1,668 
3 .................. Chicago .................................................................................. 3,079 4,291 2,738 3,814 
3 .................. Boise ...................................................................................... 2,001 2,669 1,732 2,301 
3 .................. Burlington ............................................................................... 3,230 4,468 2,872 3 ,970 
3 .................. Helena .................................................................................... 3,381 4,583 3,021 4,087 
3 .................. Duluth ..................................................................................... 5,778 8,015 5,258 7,290 
3 .................. Fairbanks ................................................................................ 9,600 13,363 8,831 12,291 
National Average .................................................................... 2,740 3,727 2,432 3,291 
TABLE VI.4—A VERAGE MANUFACTURED HOME SIMPLE PAYBACK PERIOD BY CLIMATE ZONE 
Tier 2/untiered standard 
Single-section Multi-section 
Climate Zone 1 ................................................................................................................. ....................................... 8.5 8.5 
Climate Zone 2 ................................................................................................................. ....................................... 9.3 9.6 
Climate Zone 3 ................................................................................................................. ....................................... 8.1 8.6 
National Average ............................................................................................................... ............................... 8.5 8.9 
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TABLE VI.5—A VERAGE MANUFACTURED HOME SIMPLE PAYBACK PERIOD BY CLIMATE ZONE 
Climate zone City Tier 2 standard/untiered 
standard 
Single-section Multi-section 
1 Miami ........................................................................................................................ ...................... 10.8 10.5 
1 Houston ...................................................................................................................... .................... 8.8 8.6 
1 Atlanta ...................................................................................................................... ...................... 7.3 7.1 
1 Charleston ................................................................................................................... ................... 8.4 8.2 
1 Jackson ...................................................................................................................... .................... 7.6 7.5 
1 Birmingham ................................................................................................................... ................. 7.8 7.6 
2 Phoenix ...................................................................................................................... .................... 10.1 9.8 
2 Memphis ...................................................................................................................... ................... 8.8 8.7 
2 El Paso ...................................................................................................................... ..................... 9.3 9.3 
2 San Francisco ................................................................................................................ ................ 13.0 13.2 
2 Albuquerque .................................................................................................................. ................. 9.7 9.7 
3 Baltimore .................................................................................................................... .................... 8.1 8.2 
3 Salem ........................................................................................................................ ..................... 11.2 11.6 
3 Chicago ...................................................................................................................... .................... 8.5 8.5 
3 Boise ........................................................................................................................ ...................... 10.3 10.5 
3 Burlington ................................................................................................................... .................... 8.6 8.7 
3 Helena ....................................................................................................................... ..................... 8.1 8.2 
3 Duluth ....................................................................................................................... ...................... 5.9 5.9 
3 Fairbanks .................................................................................................................... .................... 4.0 4.1 
National Average ............................................................................................................... ............. 8.5 8.9 
TABLE VI.6—N ATIONAL AVERAGE PER-HOME COSTSAVINGS  
Single-section Multi-section 
Tier 2 Standard 
Lifecycle Cost Savings (30-Year Lifetime) ...................................................................................... ........................ $2,740 $3,727 
Lifecycle Cost Savings (10-Year Lifetime) ...................................................................................... ........................ $632 $788 
Annual Energy Cost Savings in 2020$ ............................................................................................ ....................... $331 $475 
Simple Payback Period .......................................................................................................... ................................. 8.5 8.9 
Untiered Standard 
Lifecycle Cost Savings (30-Year Lifetime) ...................................................................................... ........................ $2,432 $3,291 
Lifecycle Cost Savings (10-Year Lifetime) ...................................................................................... ........................ $518 $622 
Annual Energy Cost Savings in 2020$ ............................................................................................ ....................... $331 $475 
Simple Payback Period .......................................................................................................... ................................. 8.5 8.9 
TABLE VI.7—C UMULATIVE FULL-FUEL-CYCLE NATIONAL ENERGY SAVINGS OF MANUFACTURED HOMES PURCHASED 2023– 
2052 WITH A 30-Y EARLIFETIME  
Single-section 
(quads) Multi-section 
(quads) 
Tiered Standard 
Climate Zone 1 ................................................................................................................. ....................................... 0.163 0.526 
Climate Zone 2 ................................................................................................................. ....................................... 0.134 0.451 
Climate Zone 3 ................................................................................................................. ....................................... 0.265 0.405 
Total .......................................................................................................................... ........................................ 0.562 1.382 
Untiered Standard 
Climate Zone 1 ................................................................................................................. ....................................... 0.276 0.542 
Climate Zone 2 ................................................................................................................. ....................................... 0.231 0.463 
Climate Zone 3 ................................................................................................................. ....................................... 0.336 0.408 
Total .......................................................................................................................... ........................................ 0.843 1.414 
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TABLE VI.8—N ETPRESENT VALUE OF CONSUMER BENEFITS FOR MANUFACTURED HOMES PURCHASED 2023–2052 W ITH 
A30-Y EARLIFETIME AT A 7% D ISCOUNT RATE 
Single-section 
billion 2020$ Multi-section 
billion 2020$ 
Tiered Standard 
Climate Zone 1 ................................................................................................................. ....................................... $0.15 $0.31 
Climate Zone 2 ................................................................................................................. ....................................... 0.12 0.21 
Climate Zone 3 ................................................................................................................. ....................................... 0.37 0.33 
Total .......................................................................................................................... ........................................ 0.65 0.85 
Untiered Standard 
Climate Zone 1 ................................................................................................................. ....................................... 0.16 0.30 
Climate Zone 2 ................................................................................................................. ....................................... 0.10 0.20 
Climate Zone 3 ................................................................................................................. ....................................... 0.29 0.32 
Total .......................................................................................................................... ........................................ 0.55 0.82 
TABLE VI.9—N ETPRESENT VALUE OF CONSUMER BENEFITS FOR MANUFACTURED HOMES PURCHASED 2023–2052 W ITH 
A30-Y EARLIFETIME AT A 3% D ISCOUNT RATE 
Single-section 
billion 2020$ Multi-section 
billion 2020$ 
Tiered Standard 
Climate Zone 1 ................................................................................................................. ....................................... $0.45 $1.15 
Climate Zone 2 ................................................................................................................. ....................................... 0.37 0.89 
Climate Zone 3 ................................................................................................................. ....................................... 1.07 1.16 
Total .......................................................................................................................... ........................................ 1.90 3.20 
Untiered Standard 
Climate Zone 1 ................................................................................................................. ....................................... 0.57 1.11 
Climate Zone 2 ................................................................................................................. ....................................... 0.43 0.83 
Climate Zone 3 ................................................................................................................. ....................................... 0.96 1.10 
Total .......................................................................................................................... ........................................ 1.96 3.03 
TABLE VI.10—E MISSIONS REDUCTIONS FOR MANUFACTURED HOMES PURCHASED 2023–2052 W ITH A 30-Y EARLIFETIME  
Pollutant Tiered standard Untiered standard 
Single-section Multi-section Single-section Multi-section 
Site Emissions Reductions 
CO 2(million metric tons) ................................................................................. 23.1 52.7 33.5 53.8 
Hg (metric tons) ............................................................................................... 0.036 0.094 0.055 0.096 
NO X(thousand metric tons) ............................................................................ 12.6 26.1 17.4 26.6 
SO2(thousand metric tons) ............................................................................. 8.6 20.0 12.5 20.4 
CH4(thousand metric tons) ............................................................................. 1.25 3.04 1.86 3.11 
N2O (thousand metric tons) ............................................................................. 0.25 0.55 0.36 0.57 
Upstream Emissions Reductions 
CO 2(million metric tons) ................................................................................. 2.35 5.0 3.3 5.1 
Hg (metric tons) ............................................................................................... 1.79E–04 4.35E–0 4 2.67E–04 4.45E–04 
NO X(thousand metric tons) ............................................................................ 29.6 63.5 41.7 64.8 
SO2(thousand metric tons) ............................................................................. 0.24 0.46 0.318 0.47 
CH4(thousand metric tons) ............................................................................. 151 347 219 354 
N2O (thousand metric tons) ............................................................................. 0.013 0.026 0.017 0.026 
Total Emissions Reductions 
CO 2(million metric tons) ................................................................................. 25.5 57.7 36.8 58.9 
Hg (metric tons) ............................................................................................... 0.036 0.094 0.056 0.096 
NO X(thousand metric tons) ............................................................................ 42 90 59 91 
SO2(thousand metric tons) ............................................................................. 8.9 20.4 12.9 20.9 
CH4(thousand metric tons) ............................................................................. 152 350 221 357 
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TABLE VI.10—E MISSIONS REDUCTIONS FOR MANUFACTURED HOMES PURCHASED 2023–2052 W ITH A 30-Y EAR 
LIFETIME —Continued 
Pollutant Tiered standard Untiered standard 
Single-section Multi-section Single-section Multi-section 
N2O (thousand metric tons) ............................................................................. 0.26 0.58 0.38 0.59 
TABLE VI.11—N ETPRESENT VALUE OF MONETIZED BENEFITS FROM GHG ANDEMISSIONS REDUCTIONS  
Monetary benefits Discount rate 
% Net present value 
million 2020$ 
Tiered standard Untiered standard 
Single-section Multi-section Single-section Multi-section 
GHG Reduction (using avg. social costs at 5% discount 
rate) * ................................................................................ 5 247.8 563.0 358.0 574.9 
GHG Reduction (using avg. social costs at 3% discount 
rate) * ................................................................................ 3 1,047.3 2,375.8 1,511.8 2,426.0 
GHG Reduction (using avg. social costs at 2.5% discount 
rate) * ................................................................................ 2.5 1,718.8 3,896.9 2,480.4 3,979.1 
GHG Reduction (using 95th percentile social costs at 3% 
discount rate) * .................................................................. 3 3,147.6 7,138.5 4,543.0 7,289.0 
NO XReduction ** ................................................................. 3 111.4 221.8 153.2 230.8 
7 38.8 77.5 53.4 80.7 
SO2Reduction ** .................................................................. 3 171.6 355.4 239.6 370.5 
7 60.4 126.0 84.6 131.4 
* Estimates of SC-CO 2SC-CH 4, and SC-N 2O are calculated using a range of discount rates for use in regulatory analyses. Three sets of val-
ues are based on the average social costs from the integrated assessment models, at discount rates of 5 percent, 3 percent, and 2.5 percent. 
The fourth set, which represents the 95th percentile of the social cost distributions calculated using a 3-percent discount rate, is included to rep-resent higher-than-expected impacts from climate change further out in the tails of the social cost distributions. The social cost values are emis-sion year specific. See section IV.D of the August 2021 MH SNOPR for more details. 
** The benefits from NO
Xand SO 2were based on the low estimate monetized value. 
A. Sensitivity Analysis Results— 
Alternate R–21 Exterior Wall Insulation for Climate Zone 2 and 3 Combined With Alternate Size-Based Tier 
Threshold for Tiered Standard 
DOE also considered the same 
sensitivity analysis using the alternate R–21 exterior wall insulation for climate zone 2 and 3, but using the alternate 
size-based tier threshold (as discussed in section V) instead of the manufacturer’s retail list price tier threshold (as discussed in section III.B). 
The following tables present the 
results for the NIA and emissions analyses results based on this sensitivity for the tiered standard only. The LCC and PBP results for Tier 1 presented in 
section IV and Tier 2/untiered standard presented in section VI would remain unchanged for this sensitivity analysis. The NIA and emissions analysis results for the untiered standard presented in section VI would remain unchanged for this sensitivity analysis. 
TABLE VI.12—C UMULATIVE FULL-FUEL-CYCLE NATIONAL ENERGY SAVINGS OF MANUFACTURED HOMES PURCHASED  
2023–2052 W ITH A 30-Y EARLIFETIME UNDER THE ALTERNATE SIZE-BASED THRESHOLD  
Tiered standard 
Single-section 
(quads) Multi-section 
(quads) 
Climate Zone 1 ................................................................................................................. ....................................... 0.123 0.542 
Climate Zone 2 ................................................................................................................. ....................................... 0.100 0.463 
Climate Zone 3 ................................................................................................................. ....................................... 0.239 0.408 
Total .......................................................................................................................... ........................................ 0.462 1.414 
TABLE VI.13—N ETPRESENT VALUE OF CONSUMER BENEFITS FOR MANUFACTURED HOMES PURCHASED 2023–2052 
WITH A 30-Y EARLIFETIME UNDER THE ALTERNATE SIZE-BASED THRESHOLD  
Tiered standard 7% discount rate 3% discount rate 
Single-section 
billion 2020$ Multi-section 
billion 2020$ Single-section 
billion 2020$ Multi-section 
billion 2020$ 
Climate Zone 1 ................................................................................................ $0.15 $0.31 $0.40  $1.17 
Climate Zone 2 ................................................................................................ 0.13 0.20 0.35 0.89 
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TABLE VI.13—N ETPRESENT VALUE OF CONSUMER BENEFITS FOR MANUFACTURED HOMES PURCHASED 2023–2052 
WITH A 30-Y EARLIFETIME UNDER THE ALTERNATE SIZE-BASED THRESHOLD —Continued 
Tiered standard 7% discount rate 3% discount rate 
Single-section 
billion 2020$ Multi-section 
billion 2020$ Single-section 
billion 2020$ Multi-section 
billion 2020$ 
Climate Zone 3 ................................................................................................ 0.40 0.33 1.10 1.15 
Total .......................................................................................................... 0.68 0.84 1.85 3.22 
TABLE VI.14—E MISSIONS REDUCTIONS ASSOCIATED WITHELECTRICITY PRODUCTION FOR MANUFACTURED HOMES  
PURCHASED 2023–2052 W ITH A 30-Y EARLIFETIME UNDER THE ALTERNATE SIZE-BASED THRESHOLD  
Tiered standard 
Pollutant Single-section Multi-section 
Site Emissions Reductions 
CO 2(million metric tons) .......................................................................................................... ............................... 19.5 53.8 
Hg (metric tons) ............................................................................................................... ........................................ 0.0292 0.096 
NO X(thousand metric tons) ......................................................................................................... ........................... 10.9 26.6 
SO2(thousand metric tons) ......................................................................................................... ............................ 7.2 20.4 
CH4(thousand metric tons) ......................................................................................................... ............................ 1.03 3.11 
N2O (thousand metric tons) ....................................................................................................... .............................. 0.21 0.57 
Upstream Emissions Reductions 
CO 2(million metric tons) .......................................................................................................... ............................... 2.0 5.1 
Hg (metric tons) ............................................................................................................... ........................................ 1.48E–04 4.45E–04 
NO X(thousand metric tons) ......................................................................................................... ........................... 25.4 64.8 
SO2(thousand metric tons) ......................................................................................................... ............................ 0.21 0.47 
CH4(thousand metric tons) ......................................................................................................... ............................ 127 354 
N2O (thousand metric tons) ....................................................................................................... .............................. 0.011 0.026 
Total Emissions Reductions 
CO 2(million metric tons) .......................................................................................................... ............................... 21.5 58.9 
Hg (metric tons) ............................................................................................................... ........................................ 0.029 0.0964 
NO X(thousand metric tons) ......................................................................................................... ........................... 36.3 91.4 
SO2(thousand metric tons) ......................................................................................................... ............................ 7.4 20.9 
CH4(thousand metric tons) ......................................................................................................... ............................ 128 357 
N2O (thousand metric tons) ....................................................................................................... .............................. 0.23 0.59 
TABLE VI.15—N ETPRESENT VALUE OF MONETIZED BENEFITS FROM GHG ANDEMISSIONS REDUCTIONS UNDER THE  
ALTERNATE SIZE-BASED THRESHOLD  
Tiered standard 
Monetary Benefits Discount rate 
% Net present value 
million 2020$ 
Single-section Multi-section 
GHG Reduction (using avg. social costs at 5% discount rate) * ................................................. 5 208.5 574.9 
GHG Reduction (using avg. social costs at 3% discount rate) * ................................................. 3 881.3 2,426.0 
GHG Reduction (using avg. social costs at 2.5% discount rate) * .............................................. 2.5 1,446.6 3,979.1  
GHG Reduction (using 95th percentile social costs at 3% discount rate) * ................................ 3 2,648.9 7,289.0 
NO XReduction ** .................................................................................................................... ..... 3 96.4 230.8 
7 33.5 80.7 
SO2Reduction ** .................................................................................................................... ..... 3 147.2 370.5 
7 51.7 131.4 
* Estimates of SC-CO 2SC-CH 4, and SC-N 2O are calculated using a range of discount rates for use in regulatory analyses. Three sets of val-
ues are based on the average social costs from the integrated assessment models, at discount rates of 5 percent, 3 percent, and 2.5 percent. 
The fourth set, which represents the 95th percentile of the social cost distributions calculated using a 3-percent discount rate, is included to rep-resent higher-than-expected impacts from climate change further out in the tails of the social cost distributions. The social cost values are emis-sion year specific. See section IV.D of the August 2021 MH SNOPR for more details. 
** The benefits from NO
Xand SO 2were based on the low estimate monetized value. 
VerDate Sep<11>2014 16:36 Oct 25, 2021 Jkt 256001 PO 00000 Frm 00018 Fmt 4702 Sfmt 4702 E:\FR\FM\26OCP1.SGM 26OCP159060 Federal Register / Vol. 86, No. 204 / Tuesday, October 26, 2021 / Proposed Rules 
VII. Comparison of the August 2021 MH 
SNOPR and NODA Results 
This section provides summary tables 
that compare the results from the 
August 2021 MH SNOPR to all the scenarios presented in this NODA, including the sensitivity analyses. As such, each table presents results for the: (1) August 2021 MH SNOPR analysis; (2) NODA updated SNOPR analysis (section IV); (3) NODA sensitivity— alternate size-based tier threshold (section V); (4) NODA sensitivity— alternate R–21 wall insulation for climate zone 2 and 3 for Tier 2 and untiered (section VI); and (5) NODA sensitivity—alternate R–21 wall insulation for climate zone 2 and 3 and alternate size-based tier threshold (section VI.A). 
In the August 2021 MH SNOPR, DOE 
estimated the SNOPR would result in a decrease in shipments of about 53,329 
homes (single section and multi-section combined) for the tiered standard and about 71,290 homes (single section and multi-section combined) for untiered standards based on a price elasticity of demand of –0.48 for the 30 year analysis period (2023–2052). 86 FR 47744, 47758. Table VII.1 presents the same results for the NODA and sensitivity analyses. 
TABLE VII.1—C HANGE INSHIPMENTS FOR TIERED AND UNTIERED STANDARDS  
Reduction in shipments (total) 
Tiered Untiered 
August 2021 MH SNOPR ........................................................................................................... ............................. 53,329 71,290 
NODA Updated SNOPR ............................................................................................................. ............................. 45,562 70,203 
Sensitivity—Alternate Size-Based Tier Threshold ................................................................................ ................... 38,288 N/A 
Sensitivity—Alternate R–21 Wall Insulation ..................................................................................... ....................... 36,648 53,185 
Sensitivity—Alternate R–21 Wall Insulation and Size-Based Tier Threshold ....................................................... .. 31,956 N/A 
The following tables present the NPV 
results for the August 2021 MH SNOPR 
and all the scenarios presented in this NODA, including the sensitivity 
analyses. 
TABLE VII.2—N ETPRESENT VALUE OF CONSUMER BENEFITS FOR MANUFACTURED HOMES PURCHASED 2023–2052 W ITH 
A30-Y EARLIFETIME AT A 7% D ISCOUNT RATE 
[In billion 2020$]*  
Climate zone August 2021 
MH SNOPR NODA 
updated 
SNOPR Sensitivity— 
alternate size- 
based tier 
threshold Sensitivity— 
alternate R–21 
wall insulation Sensitivity— 
alternate R–21 
wall insulation 
and size- 
based tier 
threshold 
Tiered Standard (Single-section + Multi-section) 
1 ........................................................................................... $0.69 $0.46 $0.46 $0.46 $0.46 
2 ........................................................................................... 0.16 0.07 0.10 0.33 0.33 
3 ........................................................................................... 0.78 0.51 0.57 0.70 0.73 
Total .............................................................................. 1.62 1.04 1.13 1.50 1.52 
Untiered Standard (Single-section + Multi-section) 
1 ........................................................................................... 0.70 0.46 N/A 0.46 N/A 
2 ........................................................................................... 0.06 (0.10) N/A 0.30 N/A 
3 ........................................................................................... 0.61 0.27 N/A 0.61 N/A 
Total .............................................................................. 1.36 0.63 N/A 1.37 N/A 
* Negative values in parenthesis. 
TABLE VII.3—N ETPRESENT VALUE OF CONSUMER BENEFITS FOR MANUFACTURED HOMES PURCHASED 2023–2052 W ITH 
A30-Y EARLIFETIME AT A 3% D ISCOUNT RATE 
[In billion 2020$] * 
Climate zone August 2021 MH 
SNOPR NODA updated 
SNOPR Sensitivity— 
alternate size- 
based tier 
threshold Sensitivity— 
alternate R–21 
wall insulation Sensitivity— 
alternate R–21 
wall insulation 
and size- 
based tier 
threshold 
Tiered Standard (Single-Section + Multi-Section) 
1 ....................................................................... $2.39 $1.60 $1.57 $1.60 $1.57 
2 ....................................................................... 1.17 0.74 0.79 1.26 1.24 
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TABLE VII.3—N ETPRESENT VALUE OF CONSUMER BENEFITS FOR MANUFACTURED HOMES PURCHASED 2023–2052 W ITH 
A30-Y EARLIFETIME AT A 3% D ISCOUNT RATE—Continued 
[In billion 2020$] * 
Climate zone August 2021 MH 
SNOPR NODA updated 
SNOPR Sensitivity— 
alternate size- 
based tier 
threshold Sensitivity— 
alternate R–21 
wall insulation Sensitivity— 
alternate R–21 
wall insulation 
and size- 
based tier 
threshold 
3 ....................................................................... 2.84 1.85 1.95 2.23 2.25 
Total .......................................................... 6.40 4.20 4.31 5.10 5.07 
Untiered Standard (Single-Section + Multi-Section) 
1 ....................................................................... 2.48 1.68 N/A 1.68 N/A 
2 ....................................................................... 1.02 0.44 N/A 1.26 N/A 
3 ....................................................................... 2.56 1.40 N/A 2.06 N/A 
Total .......................................................... 6.06 3.51 N/A 4.99 N/A 
TABLE VII.4—N ETPRESENT VALUE OF MONETIZED BENEFITS FROM GHG ANDEMISSIONS REDUCTIONS  
Monetary benefits Discount rate 
% Net present 
value 
million 2020$ NODA updated 
SNOPR Sensitivity— 
alternate size- 
based tier 
threshold Sensitivity— 
alternate R–21 
wall insulation Sensitivity— 
alternate R–21 
wall insulation 
and size- 
based tier 
threshold August 2021 MH 
SNOPR 
Tiered Standard 
GHG ................................. 5 $1,075.4 $842.1 $809.2 $810.8 $783.4 
3 4,525.0 3,555.4 3,416.5 3,423.1 3,307.2 
NO X.................................. 3 446.0 348.1 339.5 333.1 327.2 
7 157.2 121.5 118.5 116.3 114.2 
SO2.................................. 3 734.7 549.5 536.2 527.0 517.7 
7 259.3 194.3 189.6 186.4 183.1 
Untiered Standard 
GHG ................................. 5 1,190.5 982.9 N/A 932.9 N/A 
3 5,009.4 4,149.4 N/A 3,937.7 N/A 
NO X.................................. 3 491.7 408.1 N/A 384.0 N/A 
7 173.3 142.5 N/A 134.1 N/A 
SO2.................................. 3 811.0 646.2 N/A 610.1 N/A 
7 286.3 228.7 N/A 216.0 N/A 
VIII. Reopening of Comment Period 
For the August 2021 MH SNOPR, 
comments were originally due no later 
than October 25, 2021. In light of this NODA, DOE has determined that it is appropriate to reopen the comment period to allow additional time for interested parties to prepare and submit comments. Therefore, DOE is reopening the comment period and will accept comments, data, and information on the August 2021 MH SNOPR and this NODA on and before November 26, 2021. Accordingly, DOE will consider any comments received by this date to be timely submitted. 
IX. Public Participation 
While DOE is not requesting 
comments on specific portions of the 
analysis, DOE is interested in receiving comments on all aspects of the data and 
analysis presented in the NODA and supporting documentation that can be found at: www1.eere.energy.gov/ buildings/appliance_ standards/ 
standards.aspx?productid=64. 
A. Submission of Comments 
DOE will accept comments, data, and 
information regarding this supplemental 
notice of proposed rulemaking before or after the public meeting, but no later than the date provided in the 
DATES  
section at the beginning of this proposed 
rule. Interested parties may submit comments, data, and other information using any of the methods described in the 
ADDRESSES section at the beginning 
of this document. 
Submitting comments via 
www.regulations.gov. The 
www.regulations.gov web page will require you to provide your name and 
contact information. Your contact information will be viewable to DOE Building Technologies staff only. Your contact information will not be publicly viewable except for your first and last names, organization name (if any), and submitter representative name (if any). If your comment is not processed properly because of technical difficulties, DOE will use this information to contact you. If DOE 
cannot read your comment due to technical difficulties and cannot contact you for clarification, DOE may not be able to consider your comment. 
However, your contact information 
will be publicly viewable if you include it in the comment itself or in any documents attached to your comment. Any information that you do not want 
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to be publicly viewable should not be 
included in your comment, nor in any document attached to your comment. Otherwise, persons viewing comments will see only first and last names, organization names, correspondence containing comments, and any documents submitted with the comments. 
Do not submit to www.regulations.gov 
information for which disclosure is restricted by statute, such as trade secrets and commercial or financial information (hereinafter referred to as Confidential Business Information (‘‘CBI’’)). Comments submitted through www.regulations.gov cannot be claimed 
as CBI. Comments received through the website will waive any CBI claims for the information submitted. For information on submitting CBI, see the Confidential Business Information section. 
DOE processes submissions made 
through www.regulations.gov before 
posting. Normally, comments will be posted within a few days of being submitted. However, if large volumes of comments are being processed simultaneously, your comment may not be viewable for up to several weeks. Please keep the comment tracking number that www.regulations.gov provides after you have successfully uploaded your comment. 
Submitting comments via email. 
Comments and documents submitted 
via email also will be posted to www.regulations.gov. If you do not want 
your personal contact information to be publicly viewable, do not include it in your comment or any accompanying documents. Instead, provide your contact information in a cover letter. Include your first and last names, email address, telephone number, and optional mailing address. The cover letter will not be publicly viewable as long as it does not include any comments. 
Include contact information each time 
you submit comments, data, documents, and other information to DOE. No telefacsimiles (‘‘faxes’’) will be accepted. 
Comments, data, and other 
information submitted to DOE electronically should be provided in PDF (preferred), Microsoft Word or Excel, WordPerfect, or text (ASCII) file format. Provide documents that are not secured, that are written in English, and that are free of any defects or viruses. Documents should not contain special characters or any form of encryption and, if possible, they should carry the electronic signature of the author. 
Campaign form letters. Please submit 
campaign form letters by the originating organization in batches of between 50 to 500 form letters per PDF or as one form letter with a list of supporters’ names compiled into one or more PDFs. This reduces comment processing and posting time. 
Confidential Business Information. 
Pursuant to 10 CFR 1004.11, any person submitting information that he or she believes to be confidential and exempt by law from public disclosure should submit via email two well-marked copies: One copy of the document marked ‘‘confidential’’ including all the information believed to be confidential, and one copy of the document marked ‘‘non-confidential’’ with the information believed to be confidential deleted. DOE will make its own determination about the confidential status of the information and treat it according to its determination. 
It is DOE’s policy that all comments 
may be included in the public docket, without change and as received, including any personal information provided in the comments (except information deemed to be exempt from public disclosure). 
X. Approval of the Office of the 
Secretary 
The Secretary of Energy has approved 
publication of this supplemental notice of proposed rulemaking; reopening of comment period and notification of data availability. 
Signing Authority 
This document of the Department of 
Energy was signed on October 19, 2021, 
by Kelly Speakes-Backman, Principal Deputy Assistant Secretary and Acting Assistant Secretary for Energy Efficiency and Renewable Energy, pursuant to delegated authority from the Secretary of Energy. That document with the original signature and date is maintained by DOE. For administrative purposes only, and in compliance with requirements of the Office of the Federal Register, the undersigned DOE Federal Register Liaison Officer has been authorized to sign and submit the document in electronic format for publication, as an official document of the Department of Energy. This administrative process in no way alters the legal effect of this document upon publication in the Federal Register. 
Signed in Washington, DC, on October 20, 
2021. 
Treena V. Garrett, Federal Register Liaison Officer, U.S. 
Department of Energy. 
[FR Doc. 2021–23188 Filed 10–25–21; 8:45 am] 
BILLING CODE 6450–01–P DEPARTMENT OF TRANSPORTATION 
Federal Aviation Administration 
14 CFR Part 39 
[Docket No. FAA–2021–0881; Project 
Identifier AD–2020–01062–T] 
RIN 2120–AA64 
Airworthiness Directives; Gulfstream 
Aerospace Corporation Airplanes 
AGENCY : Federal Aviation 
Administration (FAA), DOT. 
ACTION : Notice of proposed rulemaking 
(NPRM). 
SUMMARY : The FAA proposes to 
supersede Airworthiness Directive (AD) 2020–12–06, which applies to all Gulfstream Aerospace Corporation (Gulfstream) Model G–IV airplanes. AD 2020–12–06 requires replacing the nose wheel steering servo valve manifold, incorporating revised operating procedures into the airplane flight manual (AFM), doing a records inspection for any incidents of un- commanded nose wheel steering turns, and reporting the results to the FAA. Since the FAA issued AD 2020–12–06, the FAA determined that a typographical error was made in a citing one of the AFM documents. This proposed AD would retain the actions of AD 2020–12–06 and would correct the citation to the AFM. The FAA is proposing this AD to address the unsafe condition on these products. 
DATES : The FAA must receive comments 
on this proposed AD by December 10, 2021. 
ADDRESSES : You may send comments, 
using the procedures found in 14 CFR 11.43 and 11.45, by any of the following methods: 
•Federal eRulemaking Portal: Go to 
https://www.regulations.gov. Follow the 
instructions for submitting comments. 
•Fax: (202) 493–2251. 
•Mail: U.S. Department of 
Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue SE, Washington, DC 20590. 
•Hand Delivery: Deliver to Mail 
address above between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. 
For service information identified in 
this NPRM, contact Gulfstream Aerospace Corporation, P.O. Box 2206, Savannah, GA 31402; phone: (800) 810– 4853; email: pubs@gulfstream.com; website: https://www.gulfstream.com/ 
en/customer-support/. You may view 
this service information at the FAA, Airworthiness Products Section, 
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