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MLH
The system design is bad. There is too much air leakage between the coach and basement and you are not getting much efficiency due to this. Your cold air falls to the floor, out to the basement through the holes in the floor, the heating system, under the step, etc. You are trying to cool the outside. A quick fix is to block the step grills and floor registers. Also my unit had supply air restrictions and insufficient ceiling ducts reducing airflow and causing compressors to freeze. Dometic gave me a lot of help to get the units installation fixed.
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