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they shouldn't leak, no. But leaks aren't the cheapest thing to track down and fix, especially if it's nasty like in a coil.

interesting, my birthday is jul 3 also. in short, no, I think even if the coil is dirty he should be able to spray coil cleaner on it while it's in place, unless there's some weird circumstances here... it can be sprayed on with your average garden sprayer then it sort of foams up and drips...

how big is the house? what size is the AC unit? How many returns do you have? how big are they?