When the weather warms up, get the best room or window air conditioner by choosing one that has earned the ENERGY STAR.
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Look for holes, tears, and other signs of leaking ducts and seal them using mastic or metal (foil) tape. Insulate all the ducts you can access (such as those in the attic, crawlspace, unfinished basement, or garage). Sealing and insulating ducts can improve the efficiency of your HVAC system by as much as 20 percent.
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The ENERGY STAR Home Advisor provides customized and prioritized energy efficiency advice based on your home's profile.