If you have an older wood exterior door, it probably has an R-value of only two - and it could be leaking air due to warping.
New materials and insulation help new models stand up to weather and humidity, and keep heat where it belongs.
And don't forget to check with your utility company about rebates and other incentives - if you're an Alliant Energy utility customer in Iowa, you can get $25 cash back when you purchase and install an ENERGY STAR-certified exterior door!
The R-value of garage doors has increased over the years as well, so when it's time to replace your garage door you could be increasing the energy efficiency of the garage itself.
Most garage doors today feature a steel sandwich construction. It's a layer of steel over a urethane foam-filled core with R values up to R-12 or greater. In addition, new garage doors should be installed with a tight fitting weather seal which prevents air infiltration, and eliminates drafts.
When considering a new garage door purchase, you may also need to update your garage door opener. The current safety standard for garage door openers is a photo eye sensor. A light beam is projected parallel to the garage door and if the beam is broken, the door will not close.