Now I don't feel bad about the cab I purchased from a cost perspective.
Mine is VERY warm in the summer, the solution is to just mow w/ the open station IH. If operating very early in morning at sunrise the ventilation system is adequate. But forget it when the temps rise into the 80's F. ++
However, winter plowing, long sleeve shirt, no hat or gloves, is pure bliss.
There are photos in the thread if there is interest. I still have an A/C option and purchased the unit, but lack incentive to install. Kinda enjoy open station in the summer.
Thread link in screenshot below.