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Originally Posted by futuresoptions
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.
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Why suggest a 2 ton unit for 400 square feet of shop? I'd save the bucks on a smaller unit and spray cellulose in the attic. Lowes and HD have cellulose for less than $10/bag and you can rent the machine for free. Spray the attic space to joist depth + extra.
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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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A properly designed system with proper charge won't cry about running longer.
And I cannot see how a unit will run longer when operated with a setback thermostat. When your thermostat is set to a higher setting, the BTU gain is reduced, meaning you have fewer BTUs of heat to remove when you get home. Setback thermostats are not bunk. They do save energy, and saving energy means less runtime on the unit.