In the winter you'll have lots of condensation on the outside walls, some of
it may freeze. If you do it in the summer your garage walls, and possible
the walls in the rest of the house, will soon be covered in mold. The wood
framing may even rot.
In the summer you've got to vent the humid air from the dryer outside. In
the winter you could just blow it directly into the laundry room for a while
to see how it works out; check how much condensation you get on your
depends on the location, the dryer in parents's garage has been vented
(electric not gas) into the garage for 45+ years with no ill effects.
They put used stockings over the exhaust as backup lint catcher; no lint,
moisture or rust problems but they're in SoCal
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