Cleaning the a/c is supposed to help the unit live longer and run more efficiently (saving money on electric costs), but as a StreetEasy commenter scoffs, "It would take a hell of a lot of 'peak efficiency' to make back $350 a unit on energy costs. I mean, how does this math make any sense?"
It doesn't, concurs another, unless you've got a Cadillac of an a/c:
"When you are looking at a 25,000BTU AC, $350 is worth it. if you are looking at 6-12,000 BTU, then it's cheaper just to buy new ones every year. Each year the ACs become more economical in utilizing electricity, so donate your old and buy new."
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