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A properly sized unit (approximately 1 ton per 400 square foot of living area or newer tighter built home about 500 square feet per ton) and a properly operating unit should easily cool a space down to 74-75 still allowing for cycling or off time. your utility bill may also help in your decision of what a comfortable setting would be.

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Q: If outside air is 100 what should thermostat be set at?
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