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the head pressure in the a/c unit gets too high which makes the amp draw go up allot more than its rated for.I would say that 1mikej has the right idea, or you might be able to install an inline booster fan to help with getting the heat out faster. as far as size of duct you dont ever want to...

you are going to want to go with 4000 btu per 1000 and make sure they are ducted,depending on the a/c unit you get it will have a dry feature,regardles the first thing an a/c does is dehumidify the air.so as far as size goes you want about 16000 to 18000 btu