Got it guys. Thanks a lot for the sound advice. I won't do this :)
Time to get a dedicated heater for the garage. I just thought it was convenient to have a furnace already in the garage that I could use.
Thanks again.
Hey,
I have an attached two-stall garage and the central furnace for my home is actually located in the garage. I've love to heat my garage from the furnace and have a vent which I can open and close as I need to.
I spoke to an HVAC guy who said that it's doable but technically not up to...