I really hope there will be a wave of innovation in this area. The heat pump offerings are really slim pickings in the US as well. My idea is that augmenting w

I really hope there will be a wave of innovation in this area. The heat pump offerings are really slim pickings in the US as well. My idea is that augmenting with heat pumps is the most sensible step for most people. Such a system might provide a portion of the heat, and could be used for smaller heat zones (eg, some downstairs living room and/or bedroom) rather than the whole building. My thought is that the advantage for augmenting is that it makes the geothermal setup much more affordable. You'll not end up needing to go super deep, or to install sophisticated insulation barriers. That way, your geothermal setup can be pretty primitive.