I bet a lot of you belong to the "HVAC crapped out at the worst time" club.

The best cleaner I have ever used is Nu-Brite Condenser Coil Cleaner. Works great, just as advertised. Easy to use, doesn't kill your grass or plants. After you mix it with water and spray it on, wait about 15 minutes. As long as you wet the coils pretty well, it foams like crazy. The grime and junk in / on your coils will ooze off. Great stuff, not a bad price either.

I lightly mist my condenser first, which really helps the cleaner travel on the coils and get all the junk.

Had ours freeze up last summer—turns out it was a clogged drain line backing up the condensate. Shop vac on the outside line cleared it in five minutes.

Jabbytall said:

Had ours freeze up last summer—turns out it was a clogged drain line backing up the condensate. Shop vac on the outside line cleared it in five minutes.

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I run a half cup of bleach in the collection tray and the tube to the outdoors every spring to kill the algae.