Geothermal electrical use
Hi all - We're trying to get a feel from actual geothermal users on how well a GT system works in a fairly cold climate. We're in Ohio, zone 5-6, and regularly see winter temps in the 5-15 degree F range (along with summer days 95+, yuck!), and occasionally temps below 0F. We're looking at a two-phase, 4 ton system with 4 vertical wells, plus keeping our existing propane furnace for backup. We have an old house, but newer windows and doors and lots of insulation added, about 1600 square feet plus half basement-half crawlspace.
Does this sound like it would be a cost-effective replacement for a propane forced air furnace? I'm concerned that the supplemental electric heater that's part of the geothermal unit would be running all the time in cold weather, driving our electric bills up, or that the GT wouldn't be able to keep up and we'd end up running the propane backup half the winter. Part of me thinks that anything has to be cheaper than propane, but I feel like some of the geothermal claims are maybe a little overstated. Should I expect a big increase in electric use? Lots of supplemental heat? Or can a GT system really keep up without sending my electric bill through the roof? No sense investing in GT to reduce our propane bills if they're just replace by huge electric bills... Thanks for any advice you have.