Just looked at a house where the garage windows get condensation on the inside every night. It leaves as the day warms up. The garage is a large 3 car garage. The gas furnace is located in a mechanical room off the garage, has door that remains closed, and is vented to the outside. No other houses in the immediate area seem to have this issue. I can’t find a source where the garage would consistently get enough moisture to form condensate.
Anybody have any thoughts or run into the condition???