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As a rule you will be better off using an air handler designed for a mobile home as the smaller ductwork is designed to operate at .6 static pressure where a typical residential unit is designed for .1 to .15 static pressure.Outdoor not so important.
I have installed residential 15SEER systems in a doublewide with no problems, but rebuilt the plenum and raised air handler up so as not to trip high limit in heat mode due to the smaller trunklines you have.
PLease let me know if I can provide any more details.
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