I have moved into a new-to-me shop. Its basically a two car garage but, it also has a room behind it (with a bar, bed, bathroom, etc, same building under roof), but totally separate, that is heated and cooled with 1.5 ton unit. My shop or the garage part is very well insulated, 2x6 construction and insulated garage doors. I want to tap into the existing hvac system next door, its doable from a ducting point of view and access. What has me scratching my head is how do I deal with the existing thermostat in the other room? The other room is out around the corner with separate door access. The hvac system is obviously going to want to react to the temp in the other room. I won't have any doors or access of any kind between the two. All flex duct will be through the attic. Anybody have any ideas on how I can control heat/cool in shop when other room is not in use (which will be 95% of the time)? Any way to coexist with two separate thermostats and one unit? Randy