Thermo-Tech^® Windows and Doors are thoroughly tested for structural and thermal performance to the most widely recognized national standards. This will ensure that our products provide a lifetime of reliable, energy saving performance.

When shopping, make sure to compare structural and thermal performance ratings to ensure that you are purchasing reliable, energy-efficient windows.

Our products are structurally tested to the American Architectural Manufacturers Association (AAMA) window specifications. When comparing structural performance of windows look for the performance grade (PG). Performance grade is a window’s resistance to wind and rain. The higher the PG rating, the better.

Look for the National Fenestration Rating Council (NFRC) label for an accurate method to compare a product’s energy performance and also ensure the windows are Energy Star^® compliant in your area.

Compare the U-Factor and the Solar Heat Gain Coefficient (SHGC) of the window. U-Factor is a measure of how well a window keeps heat inside a home or building in the winter. The lower the U-Factor, the greater the insulating value of the window. SHGC measures how well a window blocks heat caused by sunlight. The lower the window’s SHGC, the less solar heat is allowed into the home by the window.