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Don't forget to clean the condensate trap at the air handler,over years of conditioning air these traps collect dust particles and lose debris in the air.Over time they build up and constrict the PVC traps inner wall and prevent the exiting of condensation.If this get's plugged you'll wish you never had central air.
Condensate trap's are usually constructed of 3/4" sched 40 PVC (white looking pipe)it will look like the letter "P" that is lying down.There should be a cap on the as-sender of the trap this should twist off,it's not threaded but held on by friction.
Stuff a piece of hose deep down into the P trap,and cover the remaining gap with a rag, put your hand over it & compress it tightly,take the other end of the hose and blow into it.You should hear a girgeling sound several seconds after this procedure,if not, pour water into the trap with a jug or soda bottle and repeat.
Most air handlers are located in attics and should be placed in a safety pan with a wet switch or safety float switch,it's purpose is to detect condensation leaking out of the unit, once the water level get to one of these detectors it cut's one leg of low voltage and turn's off the condenser before any damage is done to your ceilings.
So now that most units have been running for several weeks know take five minutes and save your self from hours of repair!
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