# Presentation: 780259

## Window Industry Support for Energy Codes in Texas

**Bill Prindle**
**July 18, 2001**

## EWC Goals

- Double market penetration of efficient fenestration products
- Help make NFRC labeling near-universal
- Educate the industry and market audiences on efficient technology
- Support Energy Star Windows

## Who is the EWC?

- Glass & Window Manufacturers
- Testing Laboratories
- Utilities & Municipalities
- Fabricators & Extruders
- Trade Associations
- Other non-profit organizations

## Lead Roles in the EWC

- Alliance: lead communications/ marketing activities
- LBNL: lead technical support efforts
- University of Minnesota/Carmody: information products & technical support
- Members: guide activity focus, support EWC activities

## EWC Program Activities

- Technical Activities/Research
- Tools and Publications
- Communications
- Codes and Standards
- Financing
- Partnership Development

## Windows and the IECC

- The IECC originally focused on saving heating energy
- Cooling energy use exceeds heating use in most parts of Texas
- Windows are the largest source of peak cooling loads
- The IECC contains a specific requirement for solar heat gain control through windows

## Benefits of IECC Solar Heat Gain Standards

- Major reductions in cooling electricity use:  estimated in the 20-30% range
- Significant reductions in air pollution emissions
- Major consumer savings in utility bills
- Improved consumer comfort

## Calculating the Benefits of Solar Control Windows

- Both Base house and IECC house:
- 2000 square feet
- 300 square feet of window area, equal orientations
- Air-source heat pump
- Other energy features meet IECC standards
- Only difference is window glazing
- Both have double pane aluminum windows
- Base house uses clear glass, IECC house uses solar control low-e

## Calculated Savings from Solar Control Windows

- 	Results of the RESFEN analysis:
- 24% savings in cooling usage and costs
- .5 kW reduction in peak cooling load
- Permits about a half-ton reduction in cooling equipment sizing
- Equipment savings help offset window cost

## Aggregate Cooling Impact Potential of the IECC in Texas

- Utility Peak Load Avoidance
- .5 kW X 100,000 homes per year =
- 	500 MW of capacity after 10 years
- Pollution Reduction (cooling energy)
- 850 kWh per home X 100,000 homes =
- 	850 million kWh/yr after 10 years
- 	***= about 4,000 tons of NOx annually***

## Industry-based Support for IECC Adoption

- EWC members provided advocacy support during the legislative process, and in initial training and promotion activities
- Glass companies are working closely with Texas window manufacturers to help make the transition to low-solar-gain technology
- EWC members are supporting monitored demonstration projects in Houston and elsewhere
- Training will be available through Texas-based experts including Texas A&M, TBEI, plus the Building Codes Assistance project, Pacific Northwest National Laboratory, and EWC members

## EWC’s Relationship to other Public/Private Programs

**NFRC**
- EWC is separate from NFRC
- Membership overlaps

**Energy Star Windows**
- EWC supports Energy Star with education
- EWC also conducts broader activities; non-Energy Star products

**Texas Window Initiative**
- EWC supports TWI via web, print, training

## Look for the Energy Star® Label

**U-value =.35 or less**

**U-value = .4 or less  SHGC= .55 or less**

**U-value = .75 or less**
**SHGC = .4 or less**

## Look for the NFRC Label

## www.efficientwindows.org

**www.efficientwindows.org**