ksg5000 wrote:
RV air conditioners are suppose to reduce the temp about 20 degree. The temp differential has nothing to do with outside temperature - both intake/outflow are measured from the inside of the RV. You don't need anything fancy to measure the temp differential. Outside temp obviously has has a significant impact on interior temp but that varies from rig to rig based on insulation, shade, etc.
As long as I'm comfortable I could care less about all of the calculations. I just posted some observed temps and I'm a Happy Camper.