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Being in Texas the A/C runs constantly. We never have our windows open because it's just too hot even at night most of the time.
I wish we could live with our windows open more.
We have 3 Trane units allset to 75 during day and 70 at night. The heater automatically switches on if the temps drop 4 degrees below that threshold.
Our units are two stage compressor units. So they run at either 100% or 50% to conserve energy. My energy bill got cut by 2/3 going to 2 stage units. They're also more reliable (though just slightly less efficient) than variable compressor units.
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