Why does the rebate only apply to windows that are ENERGY STAR® Certified with a maximum U-factor of 1.22 (W/m2·K)?

The window and door rebate is designed to assist with the additional cost of investment in highly energy efficient windows.

ENERGY STAR certification with an U-factor < 1.22 (W/m2·K) is an industry benchmark for above average window performance, as well as Provincial and Federal policies on energy efficient equipment in the building sector.