Insulated Garage Door Savings Calculator in Old Greenwich, CT
Compare R-values and estimate how much an insulated door can reduce heat loss and gain through your garage door.
How this estimate works
Heat loss through the door is roughly its area times the indoor-outdoor temperature difference divided by its R-value. Over a year, heating degree days (HDD) capture that temperature difference. The default of 5,000 HDD is a rough figure for Connecticut's climate; your local value may differ.
- The estimate assumes the garage is heated to about 65°F. For an unheated attached garage, the real savings are a fraction of this, but an insulated door still keeps the garage noticeably warmer and quieter.
- Published door R-values are usually measured at the center of a panel. Seals, gaps and windows lower the real-world value, so a good perimeter seal matters as much as the panel.
- In hot climates the same insulation reduces summer heat gain, which helps rooms above or next to the garage.
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