I’m looking for feedback on the system that has been proposed for my new home. We recently moved into a home built this year and wanted a geothermal system, but due to construction delays we decided to move in and have the geothermal system installed afterwards. I now have the specific proposal from the builder for the geothermal system and I want to make sure the plan makes sense before we proceed. Here are the details: * Home is in Western NY with approx 3700 sqft on two floors. Basement is unfinished, but we expect to finish in a few years. * 6ton Advanced Geothermal Technologies DX system with 12 taps * Two 95% efficient gas furnaces (one for each floor) – while I liked the idea of a gas furnace as supplemental heat, having 2 high efficiency furnaces seemed like overkill to me. However, when I asked the GC and HVAC contractor, they said they needed the variable speed blowers to distribute the heat from geothermal system and it was only a small extra cost to get these furnaces. (These are already installed and currently operating as two-zone heating – a thermostat on each floor. However, my understanding is that once the geothermal system is installed, the system will operate as a single zone with two blowers/furnaces because there is only one heatpump.) * Desuperheater assembly to feed hot water storage tank – this water storage tank will supply the house hot water plumbing * Radiant heat in basement floors – may not use initially until we finish the basement, although builder says we should run even when unfinished because upward radiating heat will lower cost to heat the upper floors. * 72 gallon gas water heater – this will feed into the separate hot water storage tank (which is also fed by desuperheater as described above), and also provide hot water for the radiant heat system (via manifold heat exchange). Here are my questions: 1) Does it really make sense to supplement/backup the geothermal system with dual high efficiency gas furnaces? (The ship has already sailed on this, but I want to know if this was done appropriately.) 2) Are the water tanks/flows setup properly? It’s not clear to me that this setup will significantly reduce burden on the gas water heater. I would have thought that the desuperheater could feed directly into the gas water heater (which would directly feed both hot water plumbing and radiant system) without the need for a separate storage tank. 3) Assuming the system is designed properly, how difficult is it to have it properly configured to ensure the gas furnaces and gas water heater are used as little as possible, while supplementing the geothermal system and desuperheater as needed? Are there specific aspects which I should discuss with the installer to make sure it’s done correctly? While I’m excited to be installing a geothermal system, I have some concerns because I don’t think the HVAC contractor has done a system like this before. I don’t want to find out 3yrs from now that the system was designed/installed/configured improperly. Thanks for any feedback/guidance you can provide.