We too have an insulated garage door, garage door vents and an exhaust fan that is on a timer (like a bathroom exhaust fan). These were in the house when we purchased. I assumed it was to address the heat generated by cars being operated, then parked in the garage when you get home? Or.. the prior owner had two Teslas, so I thought that the heat generated when charging of those cars may need some ventilation (one dedicated charging circuit is 220V 50 A and the second is 220V 80 A - I’l bet that made the meter spin!).
The idea of running the exhaust fan makes sense to me in the evening, but only if I am going to be out there, otherwise it cools off by morning on it’s own.
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