I do not know much about solar so I thought I would ask some people who know a lot more that I. I live in WI (green bay) and I have a dog kennel that is about 1000 sqft. I heated it and our house with wood for the last 6 years and I am about done with that. The roof faces the south. The building does have in floor heat that the wood boiler was to run but it comsumes too much wood to keep it going so I hung a HX with fan and that does a fine job keeping it warm. My thoughts are that I have this in floor tubing with all the pumps and the slab is well insulated under and on the sides and if I could let a solar system heat the water and pump it into the slab all days that are clear that it would help a great deal as the boiler could focus on heating the house instead of both. It might not work at all and that would be fine I can use propane if I need to but I think the wood for the kennel is going to be shut down this year.