Originally Posted by EastCoastCB
I don't see how a portable would do much especially while moving. We tried to use one to cool a bathroom and it didn't do much.
I agree with ECCB on this. Some owners of older motorhomes with weak or inop engine-driven A/C simply fire up their generator, connect it to their shore power plug, and power the rooftop unit while driving. In some cases, it may actually get better fuel economy.