Quote:
Originally Posted by GGG
Also an attached garage with a bonus room above will stay relatively warm (around freezing most days) in winter so heating isnt as neccessary as a non attached gargae which will just be ambient temperature.
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Last year I decided to try going without heating my detached garage. It is insulated and has vapour barrier. Just from the heat coming off the cars as well as some heat from the fridge the garage stayed above 0 all winter. A few times I ran the heat for a couple of hours during a major cold snap, but that was about it.
I would think that if there is enough heat escaping from your house into an attached garage, you might have an insulation issue.