Something you may consider trying
On my coach Thor incorrectly installed the air conditioners. They pushed up the wiring double gang box up in front of the intake coils blocking 50%-70% of the airflow through the coils. This caused the air conditioner to work very poorly. The coils would freeze up and then it would get even worse. I removed the box and wiring and installed it and routed the wiring per the manufacturer specifications. Next I carefully insulated the plenum which was poorly insulated. The air conditioners work well now. If you are interested I can provide pictures.
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