Geothermal Heat Pump Cost Calculator

Installing a geothermal (ground-source) heat pump typically costs $20,000 to $45,000+, or roughly $15 to $30 per square foot of conditioned space, with the ground loop being the biggest variable. It costs far more upfront than a furnace, AC, or air-source heat pump because of the buried loop that trades heat with the earth. But this is the gross price — a 30% federal tax credit plus state, local, and utility incentives can cut the net cost dramatically, and operating costs are the lowest of any HVAC system.

The loop is the part that makes geothermal 'geothermal,' and installing it means moving earth. A horizontal closed loop lays pipe in trenches — economical, but it needs open land. A vertical closed loop drills deep boreholes — it fits small lots but the drilling makes it the priciest. A pond/lake loop sinks coils in a suitable water body and is the cheapest when you have one. An open loop uses well water and is economical with a good well and legal discharge. Your site largely decides which loops are even feasible.

Yes — residential geothermal heat pumps currently qualify for a federal tax credit equal to 30% of the total installed cost, including the equipment, the ground loop, and labor. On a $30,000 system that's a $9,000 credit against your federal income taxes. Many states, municipalities, and electric utilities add their own rebates or credits on top. This calculator shows the gross cost; subtract roughly 30% (plus any local incentives) for a realistic net. Confirm the current credit and your tax liability with a tax professional.

For homeowners staying long-term, often yes. Geothermal is the most efficient HVAC available, delivering several units of heating or cooling per unit of electricity, so it can cut heating and cooling bills 30–60% versus conventional systems. Combine those ongoing savings with the 30% tax credit and a very long lifespan, and payback commonly lands around 5–15 years depending on climate, energy prices, and what you're replacing. If you may move soon or have a tight upfront budget, an air-source heat pump may make more sense.

Yes — a single geothermal system heats in winter and cools in summer by reversing the direction it moves heat, so it replaces both your furnace and your air conditioner. In winter it pulls warmth from the ground into the house; in summer it dumps heat from the house into the cooler ground. There's no outdoor condenser unit, it runs quietly, and many systems add a desuperheater that uses waste heat to help make hot water. That's why the calculator sizes one system to your whole conditioned area.

It depends on the loop. A horizontal loop needs the most room — trenches spread over a large area, often a sizable yard or more — and is the cheapest install if you have the space. A vertical loop needs very little surface area because the pipe goes straight down into boreholes, which is what makes geothermal possible on small lots (at a higher drilling cost). A pond loop needs a suitable body of water rather than land, and an open loop needs a productive well. A contractor's site assessment determines what's feasible.

Geothermal is sized to your home's heating and cooling load, roughly one ton of capacity per 500–600 square feet of conditioned space — so a 2,200 sq ft home needs about a 4-ton system. Good installers run a proper load calculation (Manual J) rather than guessing, since an oversized system wastes money on loop and equipment and an undersized one leans on backup heat. Entering your conditioned square footage gives the calculator a solid starting estimate before that site-specific load calc.

Geothermal usually distributes air through ducts like a conventional forced-air system, so if your existing ducts are sound and correctly sized, reusing them keeps cost down. Older or leaky ducts may need sealing or modification, and a home without suitable ducts (or converting from baseboard/radiators) needs new ductwork — the most expensive distribution scenario, adding around a third to the base rate. The calculator lets you pick reuse, modify/add, or all-new to reflect your situation.

The buried ground loop is the standout — a quality closed loop can last 50+ years, often the life of the home, since it's sealed and protected underground. The indoor heat pump typically lasts about 20–25 years, longer than a furnace or AC because it's indoors with no combustion and no weather exposure. Maintenance is light: change filters, keep coils clean, and get periodic professional check-ups. Open loops also need attention to water quality and the well pump. Low upkeep is part of the long-term value.

Usually several days to a couple of weeks, driven mostly by the loop. A horizontal loop means trenching, laying pipe, and backfilling over a few days; a vertical loop means drilling boreholes, which can run several days to over a week depending on depth and geology; a pond loop can be quick; an open loop depends on the well. Setting the indoor unit and tying into ductwork adds a couple of days, plus startup and commissioning. Site assessment, design, and permits come before any digging.