Energy-efficient doors are designed to minimize the amount of heat lost through your home's internal and external doorways. This is achieved through a combination of factors that include the material of the door, the core material, and any glass options the door has, all of which prevent air from getting in or out of the house as well as reducing the amount of heat that can pass through it.
The more leakage you can reduce, the more energy-efficient the door is, and the more money you'll save.
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