It is supposedly cheaper to run the generator and roof air. Also, I don't think the dash air would come close to cooling a 40 ft MH. It would probably cool the driver compartment ok with dash air but not the rest of the unit. Too much cubic footage and too little air volume.
About RV Tips & Tricks
Looking for advice before your next adventure? Look no further.25,187 PostsLatest Activity: Mar 18, 2026