Detached garage ventilation?
I have a detached garage in climate zone 4A — 3200 ft. elevation just outside of Asheville, NC
The garage is insulated / drywalled and has a very nice finished room above (hardwood floors, beadboard walls). Both rooms are insulated, but neither is conditioned.
The garage has windows on 3 sides and the finished room has windows on 2 sides.
I had always left the garage windows opened year round and finished room windows closed year round (unless occupied).
I have been told that I should keep the garage windows closed, particularly in the summer.
My thinking was that ventilation, even if the air outside is humid, was beneficial to the garage space. For whatever reason, I never considered leaving the windows open to the nicer room above. Perhaps that is a sign.
My question is: should the garage windows be opened in the winter? summer? neither? both?
Do I ultimately need to simply monitor humidity and consider conditioning / dehumidifying the spaces if necessary?
Knock on wood, we haven’t had noticeable issues yet, but I did think I should ask as the summers can be quite humid (although often sunny / breezy as well). Opened windows in the garage below and closed in the room above has seemed to work OK, but is it better to keep closed up?
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