I did a pretty quick heat load calc with one of the online calcs I don't remember what the number was but it was a little less the 30 so this unit should work ok. If it can keep up I have a fireplace insert and I've also thought about getting a pellet stove. There are 3 people at work that have geo installed one did the bore holes one has a pond system and the other has a horizontal system an d I have yet to talk to him yet. But the guy that did the bore holes said 200ft per ton was good and the guy with the pond system has a one acre pound that was 28ft deep and he has 4 100ft loops at the bottom for a 4 ton system. Apparently there is a local company called terra source that they talked to and the guy gave them free advice on what to install in the ground. But the purchased the indoor units and the hdpe pipe from him so I guess it wasn't really free
hopefully ill get a chance to talk to the guy with horizontal set up soon