Use insulated exterior doors
You wouldn't use single-pane windows, so why an uninsulated door?
Doors that have adequate insulation and good air seals are an important part of an energy-efficient building envelopeExterior components of a house that provide protection from colder (and warmer) outdoor temperatures and precipitation; includes the house foundation, framed exterior walls, roof or ceiling, and insulation, and air sealing materials.. Use doors rated by the National FenestrationTechnically, any transparent or translucent material plus any sash, frame, mullion, or divider attached to it, including windows, skylights, glass doors, and curtain walls. Rating Council (NFRC). Wood has an R-valueMeasure of resistance to heat flow; the higher the R-value, the lower the heat loss. The inverse of U-factor.
of about 1 per inch, so under the best of circumstances a wood exterior door has very little insulating value. Imperfect weather-stipping makes the problem worse.
Learn more in the Green Building Encyclopedia
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