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Possible causes: Low Refrigerant Poor Airflow Dirty Coils Damaged Blower Fan If you catch it in the early enough stages, you may be able to...
Yes, a mini split requires only a 3" hole (7.5 cm) in diameter through the wall. Then seal up the hole in the wall using expanding polyurethane...
You need a unit of 9000 btu. I'm not sure if there's a smaller one.