Concerned about the high cost of heating their house with propane, as well as the importance of dealing with climate change, the homeowners switched to a ground source heat pump (geothermal energy) to heat and cool their home. They also added solar photovoltaic electricity. They installed a solar array containing roughly a 15 kW roof-top array installed in 2014. The homeowners are pleased with the outcome, remarking that: “We have largely eliminated utility bills, the heating is astonishingly comfortable and we feel good about not relying on fossil fuels.” The house was net zero for 2014-2017, however, they fell slightly short in 2018-2019, apparently due to a significant drop in solar output due to more cloud cover than previous years.
Ground source heat pump was installed (GSHP) for heating and cooling in 2014. Hydronic in-floor heating with one fan coil unit for cooling in living room. Increased insulation in ceilings from R-38 (12 inches of fiberglass) to R-60 using blown-in cellulose. Spray foam added to basement rim joists for air sealing.