We want to know more about geothermal systems and what they cost. We already have a solar water heating system installed.
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We live in AZ in Prescott Valley, elevation 5100 feet. Our home is 6 years old. We have air conditioning and gas furnace heating.
Geothermal is very expensive. Perhaps you can find an experienced BPI-certified energy auditor with an HVAC background who can recommend upgrades to your home's envelope and mechanical systems to provide cost-effective energy efficiency solutions with your current systems. Make sure to look into all the available rebates, federal and local utility.