A little sweat equity now will help both your wallet and your comfort level later when summer's heat sets in. Most of the job can be done without the help of a professional, and by servicing and testing out your cooling system now, you will have plenty of time to make an appointment with an air conditioning contractor if there's any unforeseen issues. After cutting off the electricity to the unit, vacuum the outdoor condenser's exterior fins with a soft-bristled brush, and clear away bushes, weeds and overgrown grass within two feet of the unit. Indoors, replace the furnace filter on the evaporator unit, vacuum the blower compartment, and clean the condensation drain.
For the full guide to cleaning the air conditioner, click here