When I had my lanai enclosed, I asked the contractors, who confirmed my air conditioner could handle the extra floor space in my home when the doors were open. Eventually, I permanently removed one set of doors in order to better see the beautiful view behind my home, and made a kid of archway in place of the doors. I've had no issues with having an open lanai 100 percent of the time - it is now a "sun room" and open to the rest of the house like many sun rooms.
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