In-dash air conditioner - Worth converting or fixing?

When my dash unit quit cooling, I tried using house ac and gen set with fan blowing in cab area. Way too uncomfortable in Southeast Texas heat. Got it fixed and now only need cab ac while traveling and MH is cooled some when stopped. Maybe not to set temp in MH, but dash unit cools pretty good while traveling. Definately would fix it. Past experience in heat requires it for me!