Solar Heat Gain Coefficient (SHGC) for Windows
SHGC stands for Solar Heat Gain Coefficient. This number is commonly used as a guide line for rating the energy efficiency of windows and their various shading treatments.
The old term for term for this measurement was shading coefficient. SHGC values range from 0 to 1. The lower the SHGC number, the less solar gain or heat passing through the window. Many power utilities offer rebates to customers who upgrade their windows. They typically will give you a rebate based on the total SHGC number of your upgraded product.
Little-Known Secret
Most of these rebate programs will give you a rebate if your upgraded windows have a SHGC # of .4 or less.
Many times you can still qualify for a rebate if you add an exterior shading product that has a SHGC # of .4 or less. Be sure to check with your local power utility to find out the details of their specific rebate program.
The EZ Snap shading mesh has a SHGC of .1827. This SHGC number is based on a solar profile angle of 45 degrees (most common) and a clear, double pane window. Ready to put that number to work on your home? Shop exterior window shade kits cut to your openings.
Common questions
What is SHGC (Solar Heat Gain Coefficient)?
SHGC stands for Solar Heat Gain Coefficient, a number used to rate the energy efficiency of windows and their shading treatments. Values range from 0 to 1, and the lower the number, the less solar heat passes through the window. It was formerly called the shading coefficient.
What is a good SHGC number for a window?
A lower SHGC number is better because it means less heat passes through the window. Many utility rebate programs require an SHGC of 0.4 or less to qualify. Check with your local power utility for the specific details of their program.
Can adding exterior shades qualify me for a window rebate?
Often yes. Many utility rebate programs will give you a rebate if you add an exterior shading product with an SHGC of 0.4 or less, even without replacing the windows themselves. Confirm the details with your local power utility, since programs vary.
What is the SHGC of EZ Snap shading mesh?
The EZ Snap shading mesh has an SHGC of 0.1827, well below the 0.4 threshold many rebate programs require. That figure is based on a solar profile angle of 45 degrees, the most common angle, on a clear double-pane window.
