7-A-i

APPENDIX 7-A. BUILDING VARIABLES

TABLE OF CONTENTS

7-A.1 INTRODUCTION .................................................................................................7-A-1

7-A.2 RECS SAMPLE DETERMINATION...................................................................7-A-1

7-A.3 RECS 2009 DATABASE VARIABLE RESPONSE CODES..............................7-A-5

7-A.4 CBECS 2003 VARIABLES AND VALUES......................................................7-A-12

7-A.4.1 CBECS Sample determination.............................................................................7-A-12

7-A.5 CBECS 2003 DATABASE VARIABLE RESPONSE CODES .........................7-A-15

LIST OF TABLES

Table 7-A.2.1 Selection of RECS 2009 Records for Boilers (Replacements)............7-A-2

Table 7-A.2.2 Selection of RECS 2009 Records for Boilers (New Construction).....7-A-3

Table 7-A.2.3 List of RECS 2009 Variables Used for Boilers...................................7-A-3

Table 7-A.3.1 Definitions of RECS 2009 Variables Used in Life-Cycle Cost 

Analysis................................................................................................7-A-5

Table 7-A.4.1 Selection of CBECS 2003 Records for Boilers (Replacements) .......7-A-13

Table 7-A.4.2 Selection of CBECS 2003 Records for Boilers (New Construction) 7-A-14

Table 7-A.4.3 CBECS 2003 Variables Used for Boilers..........................................7-A-14

Table 7-A.5.1 CBECS 2003 Variable Response Codes............................................7-A-15
7-A-1

APPENDIX 7-A. BUILDING VARIABLES

7-A.1 INTRODUCTION

DOE created a database containing a subset of the records and variables from DOE’s 

Energy Information Administration (EIA)’s RECS 2009 using Microsoft ACCESS.

1 DOE used 

this RECS subset in the life-cycle cost (LCC) analysis of the Residential Boiler Rulemaking. 

This appendix explains the variable name abbreviations and provides definitions of the variable 

values. 

For the entire RECS 2009 dataset, refer to

http://www.eia.gov/consumption/residential/data/2009/index.cfm?view=microdata. 

7-A.2 RECS SAMPLE DETERMINATION

The RECS consists of three parts:

• Personal interviews with households for information about energy used, how it is used, 

energy-using appliances, structural features, energy efficiency measures, and 

demographic characteristics of the household.

• Telephone interviews with rental agents for households that have any of their energy use 

included in their rent. This information augments information collected from those 

households that may not be knowledgeable about the fuels used for space heating or 

water heating.

• Mail questionnaires sent to energy suppliers (after obtaining permission from households) 

to collect the actual billing data on energy consumption and expenditures.

The subset of RECS 2009 records used to study boilers met all of the following criteria:

• used a boiler as the main or secondary source of heat;

• used a heating fuel that is natural gas, liquefied petroleum gas (LPG), fuel oil, or 

electricity;

• heated only one housing unit; and

• had an energy consumption greater than zero.

The RECS 2009 weighting indicates how commonly each household configuration 

occurs in the general population. Table 7-A.2.1 shows the RECS sample weights and criteria for 

replacements and Table 7-A.2.2 shows the RECS sample weights and criteria for new 

construction. DOE made some adjustments to EIA’s weightings for each RECS 2009 household 

in order to create boiler population weights in 2020. The boiler population weights are adjusted 

to account for:

1. the fraction of boilers that produce steam compared to hot water: 14% steam compared 

to 86% hot water, 
7-A-2

2. households sharing a boiler: RECS reported weight is decreased by the number of units 

sharing the boiler as follows a) single-family unit is assumed to share a boiler with one 

other unit; b) multi-family unit (2-4 units) is assumed to share a boiler with three other 

unit; b) multi-family unit (5 or more units) is assumed to share a boiler with the number 

of reported units in the building,

3. buildings with multiple boilers: RECS-reported weight is increased by the number of 

boilers in a building for households listed in RECS 2009 with a primary and secondary 

boiler, and

4. projected growth of the number of boilers by 2020 using shipment data by state.

Table 7-A.2.1 Selection of RECS 2009 Records for Boilers (Replacements)

Product Class Algorithm No. of 

Records

RECS 

2009

DOE 

2020

Number 

of 

Houses 

million

Number 

of Boilers

million

Gas-Fired Hot Water Boiler Heating Equipment = Gas Boilera

Heated Square footage <10,000 sq ft 646 6.05 4.12

Gas-Fired Steam Boiler

Heating Equipment = Gas Boiler

House Built = before 1970

Heated Square footage <10,000 sq ft

471 4.55 0.49

Oil-Fired Hot Water Boiler Heating Equipment = Oil Boiler

Heated Square footage <10,000 sq ft 482 3.99 2.63

Oil-Fired Steam Boiler

Heating Equipment = Oil Boiler

House Built = before 1970

Heated Square footage <10,000 sq ft

359 3.08 0.31

Electric Boilerb Heating Equipment = Electric Boiler

Heated Square footage <10,000 sq ft 49 0.49 0.26

 a Natural Gas or LPG Boiler.

b Electric boilers are disaggregated in hot water and steam electric boilers in the National Impact Analysis
7-A-3

Table 7-A.2.2 Selection of RECS 2009 Records for Boilers (New Construction)

Product Class Algorithm No. of 

Records

RECS 

2009

DOE 

2020

Number 

of 

Houses 

million

Number 

of Boilers

million

Gas-Fired Hot Water Boiler

Heating Equipment = Gas Boiler

Heated Square footage <10,000 sq ft

House Age >= 1990

51 0.50 0.44

Gas-Fired Steam Boiler NAc 0 0.00 0.00

Oil-Fired Hot Water Boiler

Heating Equipment = Oil Boiler

Heated Square footage <10,000 sq ft

House Age >= 1990

49 0.33 0.26

Oil-Fired Steam Boiler NA 0 0.00 0.00

Electric Boiler

Heating Equipment = Electric Boiler

Heated Square footage <10,000 sq ft

House Age >= 1990

4 0.05 0.05

*Note: Used electric boiler replacement sample instead due to same (4 households) sample size.

Table 7-A.2.3 lists the variables use in the analysis. 

Table 7-A.2.3 List of RECS 2009 Variables Used for Boilers

Variable Description

Location Variables

REGIONC Census Region

DIVISION Census Division

REPORTABLE_DOMAIN Reportable states and groups of states

UR Housing unit classified as urban or rural by Census

HDD65 Heating degree days in 2009, base temperature 65F

HDD30YR Heating degree days, 30-year average 1981-2010, base 65F

CDD65 Heating degree days in 2009, base temperature 65F

CDD30YR Cooling degree days, 30-year average 1981-2010, base 65F

Household Characteristics Variables

NWEIGHT Final sample weight

DOEID Unique identifier for each respondent

TYPEHUQ Type of housing unit

YEARMADE Year housing unit was built

BTUNGSPH Natural Gas usage for space heating, in thousand BTU, 2009

BTULPSPH LPG/Propane usage for space heating, in thousand BTU, 2009

BTUFOSPH Fuel Oil usage for space heating, in thousand BTU, 2009

BTUELSPH Electricity usage for space heating, in thousand BTU, 2009

BTUELCOL Electricity usage for air-conditioning, central and window/wall 

(room), in thousand BTU, 2009

BTUNGWTH Natural Gas usage for water heating, in thousand BTU, 2009

BTULPWTH LPG/Propane usage for water heating, in thousand BTU, 2009

 

c DOE assumed that there are no steam boilers in the new construction market.
7-A-4

Variable Description

BTUFOWTH Fuel Oil usage for water heating, in thousand BTU, 2009

BTUELWTH Electricity usage for water heating, in thousand BTU, 2009

EQUIPM Type of main space heating equipment used

FUELHEAT Main space heating fuel

HEATOTH Main space heating equipment heats other homes, business, or 

farm

MAINTHT Routine service or maintenance performed on main space heating 

equipment

EQUIPAGE Age of main space heating equipment

WARMAIR Central warm-air furnace used for secondary space heating

FURNFUEL Fuel used by warm-air furnace for secondary space heating

REVERSE Heat pump used for secondary space heating

RADFUEL Fuel used by hot water system for secondary space heating

PIPEFUEL Fuel used by pipeless furnace for secondary space heating

RMHTFUEL Fuel used by built-in electric units for secondary space heating

HSFUEL Fuel used by heating stove for secondary space heating

PERMELEC Built-in electric units used for secondary space heating

CARRYEL Portable electric heaters used for secondary space heating

FPFUEL Fuel used by fireplace for secondary space heating

RNGFUEL Fuel used by cooking stove for secondary space heating

DIFFUEL Fuel used by other secondary space heating equipment

EQMAMT Portion of space heating provided by main space heating 

equipment (for homes with main and secondary heating only)

COOLTYPE Type of air conditioning equipment used

CENACHP Central air conditioner is a heat pump

USECENAC Frequency central air conditioner used in summer 2009

AGECENAC Age of central air conditioner

ACOTHERS Central air conditioner cools other homes, business, or farm

NUMBERAC Number of window/wall air conditioning units used

USEWWAC Frequency most-used window/wall air conditioning unit used in 

summer 2009

MAINTAC Routine service or maintenance performed on central air 

conditioner

NUMH2ONOTNK Number of tankless water heaters

NUMH2OHTRS Number of storage water heaters

H2OTYPE1 Type of main water heater

FUELH2O Fuel used by main water heater

WHEATOTH Main water heater is used by more than one housing unit

WHEATSIZ Main water heater size (if storage tank)

WHEATAGE Main water heater age

H2OTYPE2 Type of secondary water heater

FUELH2O2 Fuel used by secondary water heater

WHEATSIZ2 Secondary water heater size (if storage tank)

WHEATAGE2 Secondary water heater age

NCOMBATH Number of full bathrooms
7-A-5

Variable Description

WELLPUMP Well water pump used

NHSLDMEM Number of household members

Seniors* Number of household members age 65 or older

POVERTY100 Household income at or below 100% of poverty line

StationID* ID number of weather station identified with household (See 

Appendix 7-D)

CELLAR Basement in housing unit

BASEFIN Finished basement

BASEHEAT Heating used in basement

BASECOOL Cooling used in basement

PRKGPLC1 Attached garage

CRAWL Housing unit over a crawl space

ATTIC Attic in housing unit

ATTICFIN Finished attic

ATTCHEAT Heating used in attic

ATTCCOOL Cooling used in attic

STORIES Number of stories in a single-family home

NUMAPTS Number of apartment units in a 5+ unit apartment building

NAPTFLRS Number of floors in an apartment (Number of levels in housing 

unit that is an apartment)

HIGHCEIL High ceilings 

CATHCEIL Cathedral ceilings

WALLTYPE Major outside wall material

TOTSQFT Total square footage (includes all attached garages, all basements, 

and finished/heated/cooled attics)

TOTSQFT_EN

Total square footage (includes heated/cooled garages, all 

basements, and finished/heated/cooled attics). Used for EIA data 

tables.

TOTHSQFT Total heated square footage

* Not part of RECS 2009 variables.

7-A.3 RECS 2009 DATABASE VARIABLE RESPONSE CODES

Table 7-A.3.1 provides the response codes for all RECS 2009 variables used in the 

Heating Products samples.

Table 7-A.3.1 Definitions of RECS 2009 Variables Used in Life-Cycle Cost Analysis 

Variable Response Codes

ACOTHERS

0

1

-2

No

Yes

Not Applicable

AGECENAC

1

2

3

Less than 2 years old

2 to 4 years old

5 to 9 years old
7-A-6

41

42

5

-2

10 to 14 years old

15 to 19 years old

20 years or older

Not Applicable

ATTCCOOL

0

1

-2

No

Yes

Not Applicable

ATTCHEAT

0

1

-2

No

Yes

Not Applicable

ATTIC

0

1

-2

No

Yes

Not Applicable

ATTICFIN

0

1

-2

No

Yes

Not Applicable

BASECOOL

0

1

-2

No

Yes

Not Applicable

BASEFIN

0

1

-2

No

Yes

Not Applicable

BASEHEAT

0

1

-2

No

Yes

Not Applicable

BTUELCOL Thousand BTU

BTUELSPH Thousand BTU

BTUELWTH Thousand BTU

BTUFOSPH Thousand BTU

BTUFOWTH Thousand BTU

BTULPSPH Thousand BTU

BTULPWTH Thousand BTU

BTUNGSPH Thousand BTU

BTUNGWTH Thousand BTU

CARRYEL

0

1

-2

No

Yes

Not Applicable

CATHCEIL

0

1

-2

No

Yes

Not Applicable

CDD30YR Cooling degree days, 30-year average 1981-2010, base 65F

CDD65 Cooling degree days in 2009, base temperature 65F

CELLAR

0

1

-2

No

Yes

Not Applicable

CENACHP

0

1

-2

No

Yes

Not Applicable

COOLTYPE 1 Central system
7-A-7

2

3

-2

Window/wall units

Both a central system and window/wall units

Not Applicable

CRAWL

0

1

-2

No

Yes

Not Applicable

DIFFUEL

1

2

3

4

5

7

8

9

21

-2

Natural Gas

Propane/LPG

Fuel Oil

Kerosene

Electricity

Wood

Solar

District Steam

Other Fuel

Not Applicable

DIVISION

1

2

3

4

5

6

7

8

9

10

New England Census Division (CT, MA, ME, NH, RI, VT)

Middle Atlantic Census Division (NJ, NY, PA)

East North Central Census Division (IL, IN, MI, OH, WI)

West North Central Census Division (IA, KS, MN, MO, ND, 

NE, SD)

South Atlantic Census Division (DC, DE, FL, GA, MD, NC, 

SC, VA, WV)

East South Central Census Division (AL, KY, MS, TN)

West South Central Census Division (AR, LA, OK, TX)

Mountain North Sub-Division (CO, ID, MT, UT, WY)

Mountain South Sub-Division (AZ, NM, NV)

Pacific Census Division (AK, CA, HI, OR, WA)

DOEID

00001 -

12083 Unique identifier for each respondent

EQMAMT

1

2

3

-2

Almost all

About three-fourths

Closer to half

Not Applicable

EQUIPAGE

1

2

3

41

42

5

-2

Less than 2 years old

2 to 4 years old

5 to 9 years old

10 to 14 years old

15 to 19 years old

20 years or older

Not Applicable

EQUIPM

2

3

4

5

6

7

8

9

Steam or Hot Water System

Central Warm-Air Furnace

Heat Pump

Built-In Electric Units

Floor or Wall Pipeless Furnace

Built-In Room Heater

Heating Stove

Fireplace
7

-A-8

10

11

12

21-2

Portable Electric Heaters

Portable Kerosene Heaters

Cooking Stove

Other Equipment

Not Applicable

FPFUEL

127

21-2

Natural Gas

Propane/LPG

Wood

Other Fuel

Not Applicable

FUELH2O

1234578

21-2

Natural Gas

Propane/LPG

Fuel Oil

Kerosene

Electricity

Wood

Solar

Other Fuel

Not Applicable

FUELH2O2

1234578

21-2

Natural Gas

Propane/LPG

Fuel Oil

Kerosene

Electricity

Wood

Solar

Other Fuel

Not Applicable

FUELHEAT

12345789

21-2

Natural Gas

Propane/LPG

Fuel Oil

Kerosene

Electricity

Wood

Solar

District Steam

Other Fuel

Not Applicable

FURNFUEL

12345789

21-2

Natural Gas

Propane/LPG

Fuel Oil

Kerosene

Electricity

Wood

Solar

District Steam

Other Fuel

Not Applicable

H2OTYPE11 Storage water heater
7-A-9

2

-2

Tankless water heater

Not Applicable

H2OTYPE2

1

2

-2

Storage water heater

Tankless water heater

Not Applicable

HDD30YR Heating degree days, 30-year average 1981-2010, base 65F

HDD65 Heating degree days in 2009, base temperature 65F

HEATOTH

0

1

-2

No

Yes

Not Applicable

HIGHCEIL

0

1

-2

No

Yes

Not Applicable

HSFUEL

7

21

-2

Wood

Other Fuel

Not Applicable

MAINTAC

0

1

-2

No

Yes

Not Applicable

MAINTHT

0

1

-2

No

Yes

Not Applicable

NAPTFLRS

1 - 9

-2

Number of floors in apartment

Not Applicable

NCOMBATH 0 - 9 Number of full bathrooms

NHSLDMEM 0 - 15 Number of household members

NUMAPTS

5 - 995

-2

Number of apartment units

Not Applicable

NUMBERAC

1 - 15

-2

Number of window/wall air conditioning units used

Not Applicable

NUMH2OHTRS 0 - 9 Number of Storage Water Heaters

NUMH2ONOTNK 0 - 9 Number of Tankless Water Heaters

NWEIGHT Final sample weight

PERMELEC

0

1

-2

No

Yes

Not Applicable

PIPEFUEL

1

2

3

4

5

7

8

9

21

-2

Natural Gas

Propane/LPG

Fuel Oil

Kerosene

Electricity

Wood

Solar

District Steam

Other Fuel

Not Applicable

POVERTY100

0

1

No

Yes

PRKGPLC1 0 No
7-A-10

1

-2

Yes

Not Applicable

RADFUEL

1

2

3

4

5

7

8

9

21

-2

Natural Gas

Propane/LPG

Fuel Oil

Kerosene

Electricity

Wood

Solar

District Steam

Other Fuel

Not Applicable

REGIONC

1

2

3

4

Northeast Census Region

Midwest Census Region

South Census Region

West Census Region

REPORTABLE_DOMAIN

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

Connecticut, Maine, New Hampshire, Rhode Island, Vermont

Massachusetts

New York

New Jersey

Pennsylvania

Illinois

Indiana, Ohio

Michigan

Wisconsin

Iowa, Minnesota, North Dakota, South Dakota

Kansas, Nebraska

Missouri

Virginia

Delaware, District of Columbia, Maryland, West Virginia

Georgia

North Carolina, South Carolina

Florida

Alabama, Kentucky, Mississippi

Tennessee

Arkansas, Louisiana, Oklahoma

Texas

Colorado

Idaho, Montana, Utah, Wyoming

Arizona

Nevada, New Mexico

California

Alaska, Hawaii, Oregon, Washington

REVERSE

0

1

-2

No

Yes

Not Applicable

RMHTFUEL

1

2

3

Natural Gas

Propane/LPG

Fuel Oil
7-A-11

4

-2

Kerosene

Not Applicable

RNGFUEL

1

2

3

4

5

7

21

-2

Natural Gas

Propane/LPG

Fuel Oil

Kerosene

Electricity

Wood

Other Fuel

Not Applicable

Seniors

0

1

No

Yes

StationID Three character identifier for weather station

STORIES

10

20

31

32

40

50

-2

One story

Two stories

Three stories

Four or more stories

Split-level

Other type

Not Applicable

TOTCSQFT Square Feet

TOTHSQFT Square Feet

TOTSQFT Square Feet

TOTSQFT_EN Square Feet

TYPEHUQ

1

2

3

4

5

Mobile Home

Single-Family Detached

Single-Family Attached

Apartment in Building with 2 - 4 Units

Apartment in Building with 5+ Units

UR

U

R

Urban

Rural

USECENAC

1

2

3

-2

Turned on only a few days or nights when really needed

Turned on quite a bit

Turned on just about all summer

Not Applicable

USEWWAC

1

2

3

-2

Turned on only a few days or nights when really needed

Turned on quite a bit

Turned on just about all summer

Not Applicable

WALLTYPE

1

2

3

4

5

6

7

8

9

Brick

Wood

Siding (Aluminum, Vinyl, Steel)

Stucco

Composition (Shingle)

Stone

Concrete/Concrete Block

Glass

Other

WARMAIR 0 No
7-A-12

1

-2

Yes

Not Applicable

WELLPUMP

0

1

-2

No

Yes

Not Applicable

WHEATAGE

1

2

3

41

42

5

-2

Less than 2 years old

2 to 4 years old

5 to 9 years old

10 to 14 years old

15 to 19 years old

20 years or older

Not Applicable

WHEATAGE2

1

2

3

41

42

5

-2

Less than 2 years old

2 to 4 years old

5 to 9 years old

10 to 14 years old

15 to 19 years old

20 years or older

Not Applicable

WHEATOTH

0

1

-2

No

Yes

Not Applicable

WHEATSIZ

1

2

3

-2

Small (30 gallons or less)

Medium (31 to 49 gallons)

Large (50 gallons or more)

Not Applicable

WHEATSIZ2

1

2

3

-2

Small (30 gallons or less)

Medium (31 to 49 gallons)

Large (50 gallons or more)

Not Applicable

YEARMADE

1600 -

2009 Year housing unit was built

* Not part of RECS 2009 variables.

7-A.4 CBECS 2003 VARIABLES AND VALUES

The U.S. Department of Energy (DOE) created a database containing a subset of the 

records and variables from DOE’s Energy Information Administration (EIA)’s CBECS 2003.2

DOE used this CBECS subset in the life-cycle cost (LCC) analysis of the Residential Boilers. 

This appendix explains the variable name abbreviations and provides definitions of the variable 

values. For the entire CBECS 2003 dataset, refer to 

http://www.eia.doe.gov/emeu/cbecs/cbecs2003/public_use_2003/cbecs_pudata2003.html.

7-A.4.1 CBECS Sample determination

The subset of CBECS records used for residential boilers met all of the following criteria:
7-A-13

1) a boiler served as a source of heating;

2) building is not vacant; and

3) a boiler is used as the heating equipment at least a portion of the building.d

Buildings were assigned to the sub-samples based on the amount of heating area per 

boiler, with similar reasoning as for residential boilers. CBECS 2003 provides the total heating 

square footage and the fraction of heating by the boiler for each building record, but does not 

provide the number of boilers used by the building, so the entire heating square footage is used to 

determine the subsamples.

The CBECS weighting indicates how commonly each building configuration occurs in 

the general population. Table 7-A.2.1 shows the CBECS sample weights and criteria for 

replacements and Table 7-A.2.2 shows the CBECS sample weights and criteria for new 

construction. DOE made some adjustments to EIA’s weightings for each CBECS 2003

household in order to create boiler population weights in 2020. The boiler population weights 

are adjusted to account for:

1. the fraction of boilers that produce steam compared to hot water: 14% steam compared to 

86% hot water;

2. buildings with multiple boilers: CBECS reported weight is increased by the number of 

boilers in a building assuming that commercial buildings with over 5,000 sq ft have two 

boilers; and

3. projected growth of the number of boilers by 2020 using shipment data by state.

Table 7-A.4.1 Selection of CBECS 2003 Records for Boilers (Replacements)

Product Class Algorithm No. of 

Records

CBECS 

2003

DOE 2020

Number of 

Buildings 

million

Number of 

Boilers

million

Gas-Fired Hot Water Boiler Heating Equipment = Gas Boilere

Heated Square footage <10,000 sq ft 286 0.26 0.29

Gas-Fired Steam Boiler

Heating Equipment = Gas Boiler

Building Built = before 1970

Heated Square footage <10,000 sq ft

193 0.19 0.03

Oil-Fired Hot Water Boiler Heating Equipment = Oil Boiler

Heated Square footage <10,000 sq ft 75 0.11 0.11

Oil-Fired Steam Boiler

Heating Equipment = Oil Boiler

Building Built = before 1970

Heated Square footage <10,000 sq ft

60 0.09 0.01

Electric Boilerf Heating Equipment = Electric Boiler

Heated Square footage <10,000 sq ft 138 0.10 0.13

 

d Sum of the fraction of all other heating equipment is less than 100 percent. e Natural Gas or LPG Boiler.

f Electric boilers are disaggregated in hot water and steam electric boilers in the National Impact Analysis
7-A-14

Table 7-A.4.2 Selection of CBECS 2003 Records for Boilers (New Construction)

Product Class Algorithm No. of 

Records

CBECS 

2003

DOE 2020

Number of 

Buildings 

million

Number of 

Boilers

million

Gas-Fired Hot Water Boiler

Heating Equipment = Gas Boiler

Heated Square footage <10,000 sq ft

Building Age >= 1990

31 0.02 0.05

Gas-Fired Steam Boiler NAg 0 0.00 0.00

Oil-Fired Hot Water Boiler

Heating Equipment = Oil Boiler

Heated Square footage <10,000 sq ft

Building Age >= 1990

10 0.02 0.02

Oil-Fired Steam Boiler NA 0 0.00 0.00

Electric Boilerh

Heating Equipment = Electric Boiler

Heated Square footage <10,000 sq ft

Building Age >= 1990

24 0.02 0.02

Table 7-A.4.3 CBECS 2003 Variables Used for Boilers

Variable Description

Location Variables

CENDIV8 Census division

HDD658 Heating degree days (base 65)

CDD658 Cooling degree days (base 65)

REGION8 Census region

Household Characteristics Variables

PUBID8 Building identifier

ADJWT8 Final full sample building weight

YRCON8 Year of construction category

SQFT8 Square footage category

PBA8 Principal building activity

OWNER8 Owner

MAINHT8 Main heating equipment

HEATP8 Percent heated

BOILP8 Percent heated by boilers

BOILER8 Boilers inside the building

NGHT18 Natural gas used for main heating

NGHT28 Natural gas used for secondary heating

ELHT18 Electricity used for main heating

ELHT28 Electricity used for secondary heating

FKHT18 Fuel oil used for main heating

FKHT28 Fuel oil used for secondary heating

NWMNHT8 Main heating replaced since 1990

 g DOE assumed that there are no steam boilers in the new construction market.

h Electric boilers are disaggregated in hot water and steam electric boilers in the National Impact Analysis
7-A-15

ELWATR8 Electricity used for water heating

NGWATR8 Natural gas used for water heating

FKWATR8 Fuel oil used for water heating

NGHTBTU8 Natural Gas heating use (mBtu)

FKHTBTU8 Fuel Oil heating use (mBtu)

ELHTBTU8 Electric heating use (mBtu)

NGWTBTU8 Natural Gas water heating use (mBtu)

FKWTBTU8 Fuel Oil water heating use (mBtu)

ELWTBTU8 Electric water heating use (mBtu)

7-A.5 CBECS 2003 DATABASE VARIABLE RESPONSE CODES

Table 7-A.5.1 provides the response codes for all CBECS 2003 variables used in the 

Commercial Boiler samples.

Table 7-A.5.1 CBECS 2003 Variable Response Codes

Variable Response Codes

PUBID8 Unique identifier for each respondent

ADJWT8 Final sample weight

REGION8 01

02

03

04

Northeast

Midwest

South

West

CENDIV8 01

02

03

04

05

06

07

08

09

New England

Middle Atlantic

East North Central 

West North Central

South Atlantic

East South Central

West South Central

Mountain

Pacific

YRCON8 1

2

3

4

5

6

7

8

9

Before 1920

1920 to 1945

1946 to 1959

1960 to 1969

1970 to 1979

1980 to 1989

1990 to 1999

2000 to 2003

2004

SQFT8 0-9999999996

9999999997

9999999998

9999999999

0,000,000,009

Not ascertained

Refused

Don't know

HDD658 Heating degree days in 2003, base temperature 65F

CDD658 Cooling degree days in 2003, base temperature 65F
7

-A-16

PBA8 01

02

04

05

06

07

08

11

12

13

14

15

16

17

18

23

24

25

26

91

Vacant 

Office

Laboratory

Nonrefrigerated warehouse 

Food sales

Public order and safety 

Outpatient health care 

Refrigerated warehouse 

Religious worship 

Public assembly 

Education

Food service

Inpatient health care 

Nursing 

Lodging

Strip shopping mall

Enclosed mall

Retail other than mall

Service 

Other

OWNER8 01

02

03

04

05

06

07

08

09

10

Property management company 

Other corporation/partnership/LLC 

Religious organization

Other non-profit organization 

Privately-owned school

Individual owner

Other nongovernment owner 

Federal government

State government

Local government

MAINHT8

1234567Furnaces that heat air directly

Boilers inside the building

Packaged heating units

Individual space heaters 

Heat pumps for heating

District steam or hot water

Other heating equipment

HEATP80-996

997

998

999

009 

Not ascertained 

Refused 

Don't know

BOILP8

0-996

997

998

999

009 

Not ascertained 

Refused 

Don't know

BOILER8

1278Yes

No

Not Ascertained

Refused
7

-A-17

9 Don't Know

NGHT18

12789Yes

No

Not Ascertained

Refused

Don't Know

NGHT28

12789Yes

No

Not Ascertained

Refused

Don't Know

ELHT18

12789Yes

No

Not Ascertained

Refused

Don't Know

ELHT28

12789Yes

No

Not Ascertained

Refused

Don't Know

FKHT18

12789Yes

No

Not Ascertained

Refused

Don't Know

FKHT28

12789Yes

No

Not Ascertained

Refused

Don't Know

NWMNHT8

12789Yes

No

Not Ascertained

Refused

Don't Know

ELWATR8

12789Yes

No

Not Ascertained

Refused

Don't Know

NGWATR8

12789Yes

No

Not Ascertained

Refused

Don't Know

FKWATR8

127Yes

No

Not Ascertained
7-A-18

8

9

Refused

Don't Know

NGHTBTU8 Thousand BTU

FKHTBTU8 Thousand BTU

ELHTBTU8 Thousand BTU

NGWTBTU8 Thousand BTU

FKWTBTU8 Thousand BTU

ELWTBTU8 Thousand BTU
7-A-19

REFERENCES

1. U.S. Department of Energy: Energy Information Administration, Residential Energy 

Consumption Survey: 2009 RECS Survey Data, 2013. (Last accessed March, 2013.) 

<http://www.eia.gov/consumption/residential/data/2009/>

2. U.S. Department of Energy: Energy Information Administration, Commercial Buildings 

Energy Consumption Survey, 2003. (Last accessed September, 2013.) 

<http://www.eia.doe.gov/emeu/cbecs/>