Air Infiltration

Every residence experiences some level of air infiltration as a result of air pressure differences between the inside and outside of the home. Keeping air leakage to a minimum is essential for attaining energy efficiency. Structurally strong, tight windows ensure lower heating bills and fewer drafts. To pass the air leakage test and achieve NFRC certification, the window must meet the requirements of a 0.3 rating or better. In accordance to NFRC all labels will read less than or equal to 0.3. Our Majestic double hung has an actual air leakage rating of 0.02!

Air Infiltration


We go above and beyond to meet and exceed ENERGY STARĀ® requirements.

U-Factor ratings generally range from .20 to 1.20. The lower the U-Factor, the less energy you will use to heat your home.

Visible transmittance
Visible Transmittance (VT), measures the amount of light that enters through your windows. The higher the visible light transmission, the more light you get through your windows.

Solar heat gain Coefficient
A lower Solar Heat Gain Coefficient (SHGC), means less solar radiation passing through your window. The lower the Solar Heat Gain Coefficient rating means your home will remain cooler during the summer months.