Energy Efficient Doors Overview 
 
For Electric & Natural Gas Customers

Doors often gain and lose heat through direct conduction. The gain and loss of heat is measured by a U-factor, which is the rate a door conducts non-solar heat flow and is usually expressed in units of Btu/hr.

Solar heat gain is the amount of solar energy absorbed through a door and released as heat inside a home. Check the U-factor rating when looking for a door as lower ratings signify the door will be more energy efficient.

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