Performance Ratings - How It Works.

The Energy Star program was developed by the U.S Department of Energy and the U.S Environmental Protection Agency to help identify energy-efficient choices for your home. The Energy Star seal is only granted to products that demonstrate significant reduction in energy consumption in the home. The majority of Window City windows and doors meet or exceed U.S and Canadian regulations to be considered Energy Star compliant.

How Performance Ratings are Determined

U-Factor

A measurement of the amount of energy a material conducts. The lower the U-Factor, the greater the insulating effect, meaning the greater a window resists heat loss. The benefit of windows equipped with lower U-Factor glass is keeping heat loss to a minimum in the cold winter months, giving you uncompromised energy savings. A rating of 0.35 or lower is considered a good U-Factor rating.

Solar Heat Gain

Co-efficient (SHGC) Solar heat gain co-efficient is a measurement of the amount of solar radiation transmitted through a piece of glass or door material.
Southern climates can benefit from low solar heat gain co-efficient (SHGC) glass by reducing the absorption of UV rays coming through the window during the hot summer months. A great choice for dramatically keeping your air conditioning costs in check.

Energy Ratings (ER)

A window's overall ER rating is based on three factors:
1. Solar heat gain.
2. Heat loss through frames, spacers and glass.
3. Air leakage.

Ratings are based on a positive numerical system.

Energy Star Compliance

The Energy Star program was developed by the U.S Department of Energy and the U.S Environmental Protection Agency to help identify energy-efficient choices for your home. The Energy Star seal is only granted to products that demonstrate significant reduction in energy consumption in the home. Qualified Window City products have been tested and certified by an accredited NFRC independent laboratory.

Structural Compliance

Window City's products have been tested by an independent third party and have been found to meet or exceed CAN-CSA-A440-98 and AAMA performance standards.

More about Thermal and Structural Performance

Thermal Performance With our beautifully crafted doors elegant decorative glass options and inviting window and door combinations to, it's easy to make a grand entrance.

Manufacturers Statement for U.S. Tax Incentives Manufacturers are required to provide statement listing the qualified products to be retained by the homeowner for their records. Click here to view Manufacturers Statement for US 30/30 requirement (PDF Format)