As the temperature outdoors goes up, so does the cost of cooling the home. A wide range of smart energy practices can help keep utility bills in check during the summer. The following suggestions, put together by the U.S. Department of Energy and Alliance to Save Energy, can help residents stay cool when the heat is on and save on bills. Clean or replace air conditioning filters monthly or as needed. A well-maintained cooling system will run more efficiently, use less energy and lower energy bills. Also, keep outdoor and indoor air conditioner coils clean. Dirt build-up on the indoor coil can have a costly, negative effect on AC operating efficiency. ...