Can a rooftop a/c be added if there is not a roof vent?

ScottG wrote:
So it may or may not support an AC between two rafters.

Didn't want to say anything, but my gut is saying no. Biggest reason being that it might be OK in the beginning, but will start to sag after awhile. Lot of cheap RV's that puddle around the AC area as the years go by.

Then if you have a couple of people up there washing your roof (new owners hire the job out for a wash/wax) who knows what will happen when that much weight is in that area.