Don't air-condition the whole neighborhood

• Caulking and weatherstripping will keep cool air in during the summer.
• If you see holes or separated joints in your ducts, hire a professional to repair them.
• Add insulation around air conditioning ducts when they are located in unconditioned spaces such as attics, crawl spaces, and garages; do the same for whole-house fans where they open to the exterior or to the attic.
• Check to see that your fireplace damper is tightly closed.