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Actually I think I may have figured it out. The unit has a safety that shuts it off if the drain pipe is clogged. I blew out the pipe and it seems to be working OK. I guess it was shutting off...

My AC units will shut off before the temp reaches the set temp. I thought is was my thermostat so I replaced it. No change.
Example. Temp is reading 80. I set temp for 76. The AC goes on. The...