You're quite wrong. *"Space is cold", especially when you're beyond LEO
and don't have the heat of the earth aimed at half your ship.

the side of the vehicle in darness radiates the body heat fast. the
LMs walls were paper thin and not well insulated due to weight
constraints

Thermal design of the LEM is far more complicated than your gross
oversimplification.

Jeff
--
never the less it aptly described the paper thin walls of the LM done
that way to keep weight down