I built, inside my garage, an enclosed area of about 100 sq ft with a 5’ ceiling for my dogs. I used 2x6s, insulated with 6” rock wool, and then sheathed the structure with poly iso and housewrap tape. It is not exposed to the weather, but I wanted to efficiently heat/cool the area.
My problem is, not wanting to spend the money on a 6k btu mini split this very moment, used the smallest portable a/c I could find – a 5500 btu hisense portable. The structure also has the best dog door I could find, a double flapped insulated opening with magnets to hold each flap shut. Many see where this is going… the negative pressure created by the a/c in a tightly sealed small space is pulling the flaps open, effectively rendering my attention to detail pointless.
What would be the best way to combat this?
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