The Hoffer's home features a 3-ton Navigator series geothermal unit with a desuperheater that works in both heating and cooling modes. The geothermal unit is connected to two geothermal wells, each 235 ft deep. A 50-gallon Rheem Marathon hot water heater is hooked up to the desuperheater for stored heat. That water goes into the primary 50-gallon A.O. Smith Signature Premier heat pump water heater. The Solar PV system is roof mounted. The McElroy Metal Standing Seam roof is a Slate Gray color. The homeowner, Leonard Hoffer, comments that the metal roof is much lighter than their old asphalt shingles, and it reflects the sun's rays which cuts down on the cost of air conditioning during the summer. At the end of it's life, the roof can be recycled rather than placed in a landfill. The solar PV system consists of 31 panels from the REC Alpha Pure Series, 405 watts each and uses the SolarEdge 11.4 KW inverter. SnapNrack roof mounting hardware attaches to the standing seam of the roof. The percent of solar coverage is estimated at 175%. The home uses approximately 8000 kWh per year, and the system is estimated to produce around 14000 kWh per year. The Hoffer's home also has 2x6 inch exterior insulated walls, including the attached garage walls. All the exterior walls are covered with Tyvek House Wrap. Andersen Windows are used, with the majority being the Tilt Wash, except in the home's sunroom, which uses glider windows. Double pane windows with low E glaze and argon gas filled are standard in all windows. In springtime, screens are installed on the home's east, west, and south sides. The original screen material was replaced with Phifer Solar Screening, which blocks up to 90% of the sun's heat. Various LED lighting is used throughout the home.
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Yes, you read that correctly. $100 for two summers of A/C.
Geothermal + Solar
In the first month of the solar data being reported online, 545 kWh were produced. 75% was exported and 25% was used. On the consumption side, 688 kWh were used. 80% was imported. In the months following, the electric bill has been less than $16 per month for the "connection fee". The solar array went online 1/7/23. As of 5/17/23 it has produced 5,740 kWh.