Focusing on aesthetics and durability is not enough when you are looking to invest in new patio doors. Make sure that you also consider energy efficiency.


ENERGY STAR®-Rated Patio Doors

One way to find out if the patio doors you are going to buy are energy-efficient is the label. Specifically, look for the white-and-blue ENERGY STAR® label on these products. This indicates that the unit has met stringent energy performance standards.

Energy Performance Criteria

Patio doors must meet several requirements before being certified as energy-efficient by the ENERGY STAR. First, they must be manufactured by an official ENERGY STAR doors partner. Second, they must be tested and certified by the National Fenestration Rating Council® (NFRC). Lastly, the ratings must meet the ENERGY STAR guidelines.

Performance criteria for patio doors are based on the NFRC’s ratings and the amount of glass they have. Here’s a quick look at them:

  • U-Factor - This measures the patio door unit’s ability to conduct non-solar heat flow. The lower the U-factor value, the better its insulation and heat flow resistance, which are vital in keeping your home’s thermal comfort at acceptable levels.
  • Solar Heat Gain Coefficient (SHGC) - This measures the patio door unit’s ability to prevent unwanted heat gain from the sun. The lower the SHGC value, the less solar heat the doors can transmit throughout your home. This results in comfortable indoors, especially during the summer.
  • R-Value - This measures the patio door unit’s ability to prevent heat from escaping your home. It usually depends on the materials used, but unlike the two ratings above, higher R-values indicate better insulation.

Turn to Illinois Energy Windows & Siding, Inc. for your replacement windows and doors. We carry the longest warranty in the industry on patio doors, giving you peace of mind after installation.

Give us a call at (630) 627-9200, or fill out our contact form to get started. We serve residents in the following service areas: Glencoe, Darien and Highland Park.