On the advice of agentxs who had recently installed his own central AC, I decided to clean it out, but I never got around to it. I'd hoped to do it last fall, but then Yard Nazis came into my life and all but the most important maintenance issues were shelved until it was over, and it's still not over.
Last week I heard the weather report for this week and so last Friday I opened up my AC compressor box and removed 13 years worth of leaves, dirt, compost like material and acorns from the compressor box, hit the heat condensers with compressed air and followed up with a hand dishwashing detergent solution fired through a siphon fed air driven "pressure washer" of sorts. it came out lookign new but it wasn't until yesterday when I actually ran the AC for the first time that I knew for certain I'd actually done it some good. Gone was the "turbulent" noise of last year. It stands to reason that this maintenance measure will not only make the thing more electrically efficient, but it will probably add a few more years to its life.