Some tips for keeping your air conditioning running smoothly from Deborah Evans, owner of Evans Heating & Cooling in Elgin, S.C.:

Change the air filter once a month. Don't use the ultra-thick, expensive filters because they restrict air flow.

Have the unit checked twice a year, in spring and fall.

If the unit ices, turn off the thermostat and use a water hose to defrost it faster. Once it is defrosted, you can turn it back on for a cool blast while you wait for a repairman.

If your service company has an long waiting list, shop around or ask for a loaner window unit to stay cool while you wait. Remember, most units will drop the temperature inside only 20 degrees from what it is outside.

- Kristy Eppley Rupon, McClatchy Newspapers