While the weather’s still cool, schedule a tuneup for your air conditioner. Maintenance should include checking the components, lubricating fans and motors, tightening or changing belts, testing the capacitors and crankcase heater, and calibrating the thermostat. There are also a few things you can do yourself: Clear leaves, grass clippings, pollen and other debris from the screen of the condensing unit; clean out the condensate hose, so it doesn’t become blocked with algae; and keep an eye out for drip marks on the compressor and tube, because these could indicate a leak.