Re: HVAC Ducts in a Garage
What you could do is seal up the ducts in the garage so the furnace only heats/cools the house. (Move the thermostat to the house.) You may need to use space heaters in the garage to keep things from freezing. If you have gas supply, you could install a gas heater in the garage.
Or you could reroute the ducts to the addition so that they tap into the main house furnace instead of the garage furnace.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.