Okay here's the scoop on the AC maintenance, DeSantis andMunns are both too highly rated reputable companies. If you use the one inch filters you should change them every one to two months it takes minutes and they cost just a few dollars depending on the mirv rating from several reliable blogs it appears you need mirv of 8-11. 11 will remove virtually all pollen and dust particles and is at least 50% better than eight but of course more expensive. The other thing you should do at least wasley is make sure the water drain pipe is cleaned with vinegar or a light solution of bleach / water followed by a flush of your hose. If you have the thick 4-inch filters some of them are washable and others may need to be replaced 3 - 6 months
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