I have friends who have lived here 3 years who tell me they have never opened a window. I have my front screen door and the lanai door open all day when it's cool and for an hour or two early in the morning and in the evening when it's warm. I could not live in a sealed space. My AC guy said to turn off the AC while the doors are open to avoid overtaxing the system, and turn on the fan to circulate the fresh air.
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