Plenty of times I wished for aircon despite the dirty great fan on top. 42 degC at 4 grand and 90+% RH with a full load of SLF in the back and no A/C 'aint very pleasant. Especially when hauling for 6+ hours per day. And especially when the aircraft was delivered new with aircon but the bosses in air-conditioned offices saw fit to remove it to save weight.