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As an A/C guy, generally 1 ton of A/C will work per 400 square feet of living space. If your walls are insulated and your ceiling is insulated well, I would frame a 2 ton window unit in the wall considering you were on a concrete slab and had good seals on your doors. The problem with going with too much tonage is that the unit will not run long enough to remove the proper amount of humidity to where it feels comfortable. You want your unit to run to remove the humidity..... If you live in a hot but dry climate then you may be able to get away with a slightly smaller unit. If you have low ceilings I would say that a 2 ton (24,000btu) unit should do okay... if you have open ceilings then you may want to try a 28-32,0000 btu unit. You should always air the space out to get rid of unwanted heat before turning on your unit, this will allow the unit to supply cooler air, will prolong compressor life, and will keep the amperage of the unit lower. And for you guys out there that think you are saving money by turning off your a/c during the day and then turning it on when you get home to a hot house you are wrong. Your unit actually runs longer trying to bring the temps down in the house than what it does trying to maintain it.... unless you have 5'x5' holes knocked in the outside walls of your house LOL.......
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