Home-energy expert Ken Pancost opened the ceiling grate for a Chandler home's air-conditioner earlier this month, shone his flashlight inside and immediately spotted a gap where hot air from the attic was being sucked into the air-conditioner.

Instead of supplying the air-conditioner with air from inside the home, which is easy to cool, the unit was working twice as hard to cool the superhot attic air and blow it into the house.

The small gap was costing the homeowner $50 to $80 a year ...

Read more: http://www.azcentral.com/business/articles/2011/03/30/20110330aps-srp-home-energy-audits.html#ixzz1I6Tcl6St