Energy Efficiency

Steel Door Simulations

Fiberglass Door Simulations

The U.S. Environmental Protection Agency finalized the Version 7.0 Energy Star Specification for Residential Windows, Doors and Skylights.  The new criteria will go into effect on 10/23/2023.  The Energy Star performance criteria for WDS are based on four different climate zones.  Qualifying windows for the Northern zones must significantly lower the heat flow (U-factor) out of the house.  Products made for the Southern zones must achieve a lower Solar Heat Gain Coefficient (SHGC).  The Energy Star Version 7.0 specification provides a significant jump in efficiency and savings.

RSL is not listed on NFRC for entry doors because only whole systems can be certified. However, we have done all of the simulations and are ready to help our clients through the certification process.

How to calculate an IG unit’s R-Value (insulation unit of measure):
Divide the number 1 by the U-Value of the unit, e.g. a 22 x 36 ½” Clear unit has a U-Value of 0.29. 1/0.29= 3.45 (R-Value).

If all residential windows and doors sold in the United States were certified to Energy Star Version 7.0 the energy cost savings would grow to more than $156 billion each year, and more than 53 billion pounds of greenhouse gas emissions would be avoided annually.*   EPA data from 2020 shows 85% of residential windows, 79 percent of hinged entry doors, 83 percent of all patio doors and 72 percent of skylights meet the current requirements.

* Source: Yglesias, Janis, Inside Energy Star 7.0 Industry associations assist manufacturers with new reporting requirements, Window and Door Magazine, 05/26/23, pgs. 32-34.

Download files – Updated July 2023