you don't need much, the garages aren't all that bad. of course if you just moved from up north you'll freak, if you've been here for years you won't LOL. It's a simple solution, blown insulation above the garage + gaskets (more than insulation) around garage door + 1 vent overhead. You'd be surprised what a 'laundry room vent" will do to one of these garages. Not off the plenum - they can tie into a run and place it near the door into the house. There is zero effect on yoru bill since your thermostat is in the house. I can tell you that we can keep that garage very confortable with that configuration, our house prior was a oversized 3 car garage on the east side of FL.... worked like a charm. Cost me $100.
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Never give up, Never surrender.... just take your prisoners with you
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