I'll certainly defer to Jay's knowledge of the LM ECS because I honestly don't remember if it had much in the way of active heating or not. But power management was of great concern during the A13 abort. So, if cockpit active heating was prioritized off the list of things they had to have in order to survive, radiative heat loss would have resulted in a cold cabin.

Edit to add: Asking details and specifics about the Apollo spacecraft and then placing "Apollo details or specifics" off limits just doesn't make much sense. Please ask your questions. Support provided for the answers will either be relevant or not. I don't think it's fair of you to cherry pick the facts that may support a valid answer.

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Brett
Peters Creek, Alaska
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