A fiberglass front door is your best bet for peak energy efficiency. Fiberglass doors have an exceptionally insulating polyurethane foam core that provides a high R-value. The R-value is a standard measure of insulation effectiveness; higher numbers mean better insulation.
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Frequently Asked Questions
What's the R-value of a fiberglass door?
The average R-value of a fiberglass door is similar to the insulation value of the wall of an average home. When shopping for an energy efficient exterior door, remember that beauty and performance are only part of the decision process.
What is the you value of a door?
ACCA Manual J, Table 4A lists many types of doors, assigning each a U-value. U-value, as you likely know, can be converted to R-value by dividing the U-value into 1. The lower the U-value, the better the insulation. Metal w/polyurethane core w/storm: 0.17 U-value (R 5.9) Metal w/polyurethane core, no storm: 0.29 U-value