> death by cold is [...] the default problem in space

well, actually... you need lower-energy atoms for higher-energy ones to rub against to carry away the excess. there's not many atoms in vacuum, so the default problem in space is overheating. see eg. https://en.wikipedia.org/wiki/External_Active_Thermal_Contro... or https://en.wikipedia.org/wiki/Liquid_cooling_and_ventilation...

> you have to first survive the freezing trip to Venus. So you need heating and air conditioning. A lot. Of both.

the heating part is very, very wrong. the AC would be Atmospheric Control, see https://en.wikipedia.org/wiki/International_Space_Station#Sy....