If you are vision-impaired or have some other disability under the Americans with Disabilities Act or a similar law, and you wish to discuss potential accommodations related to shopping or ordering on or using the benefits of our website, please contact Alliant Energy at 1-800-ALLIANT (800-255-4268).

Exterior & garage doors

What makes a door energy efficient?
Improved materials and insulation help new doors stand up to weather and humidity - and keep heat where it belongs.
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Exterior doorIf 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.

  • Steel doors, starting around $150, offer good insulation at a low cost. The paintable steel surface holds up well to normal wear and tear, and any dents can be repaired easily with auto-body putty. A steel door with a polyurethane foam core offers an insulating value of about R-11.
  • Fiberglass doors offer a wood-grain look that can be stained using special materials. At about $300, prices for fiberglass doors reflected the upscale appearance. Insulation values range from R-5 to R-10.
  • Composite doors achieve a true wood appearance with a wood veneer laminated over a steel door with a one-inch foam core. Another style available features a wood panel exterior with a ½-inch foam core. These models are the most expensive, typically $300 and up. Insulation values range from R-5 to R-10.

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!      

Insulated garage doorGarage doors

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.      

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Questions about the show? Call 1-866-ALLIANT (866-255-4268), use our Contact Us form or send an e-mail.
If you are vision-impaired or have some other disability under the Americans with Disabilities Act or a similar law, and you wish to discuss potential accommodations related to shopping or ordering on or using the benefits of our website, please contact Alliant Energy at 1-800-ALLIANT (800-255-4268).