Our definition of a high performance window requires an SHGC rating of 0.40 or lower and a maximum U-factor of 0.75.

Double pane low solar heat gain low-E glass will qualify with any frame type. However, we recommend an improved window frame for additional comfort and energy savings where feasible.

The low SHGC requirement ensures that cooling costs will be significantly reduced throughout Texas. Improved frames will provide additional savings year round.