As already said if the system is working properly there really isn't much to do except clean the filters! Heres what I do. I blow off and hose down any dirt and dust on the condenser unit which is the one that sits outside of your house. I also use a condenser cover sold at Home Depot to cover the unit through the winter. This keeps out dirt snow and ice which can create lots of inside rust. The evaporator coil or (A- coil) is inside the main plenum of the inside unit. There is usually a gravity condensate drain on this unit which can sometimes clog up if dirty. I clean out the trap on this drain because it did clog on me once and I had puddles of water in my basement. Sometimes there is a small condensate pump mounted on the side of the indoor unit. You may want to clean it out also to prevent clogs. Anyway thats all I do to my system.
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