I travel with pets. Dash and genset air both on.
When the gen broke en route to Florida during 90+ degree weather I had to get creative really fast.
I got out all my cold weather gear.
I put the vent pillows up in all the vents and put my van sunshades up in all the windows. Covered the skylights. It is amazing how much heat you can keep 'out' doing just this. The temps dropped 20 degrees inside the MH.
My dash air now could keep everyone comfortable.
Have to tell you after our little emergency and 'having' to insulate the windows, etc., I now do not even use my gen any more. I put up my heat repelling items and use just the dash air now. Actually if you put up the insulation and run the coach air you will find it can then keep your coach even 'cooler' than before.
I travel between the hours of 6 am until 1 pm, and put up the insulating stuff when traveling during the hot months. If I have to. Which I try hard NOT to travel during these months unless absolutely necessary.