One thing to consider: when the air is very dry (10-20%), I'm very comfortable in a 77 degree room and cold in a 75 degree room. Before you spend the money on an AC unit, consider really letting it dry out. Run the dehumidifier a lot, seal air gaps, don't leave the door open, etc.
Once you get it really dry, you may not have to run the dehumidifier as much. Put it on a timer and run it overnight. By the time you use your theater, it may be cool and dry.
This won't work as well if water is wicking in through your basement walls at a fast rate.
However, it's easy to try before spending money on an AC.
Bee Cave (Austin), TX
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