Vent fans and a/c at the same time
At home we find it unnecessary in summer to run the het pumps on the own stairs level usually. We have a huge vaulted ceilign on one side and the cold a/c air sinks down, and sometimes makes it really...
Forum Discussion
I would only run the vent fan for cooling along with the roof A/C if the interior temp was considerably warmer than the outside temp. Such as when first arriving to a heat soaked RV. Otherwise just let the A/C do its thing.
