Calculate annual savings from a geothermal heat pump vs conventional HVAC. Compare operating costs for heating and cooling with ground-source heat pumps.
Geothermal heat pumps (also called ground-source heat pumps) use the stable temperature of the earth to heat and cool buildings with remarkable efficiency. While conventional furnaces and air conditioners operate at 80–95% efficiency, geothermal systems achieve 300–500% efficiency (COP of 3–5) because they move heat rather than create it.
The savings come from dramatically lower operating costs. A gas furnace at 95% efficiency costs $1.00 to produce $0.95 of heat. A geothermal system with a COP of 4 costs $0.25 in electricity to move $1.00 of heat from the ground. For cooling, geothermal outperforms conventional AC by 30–50%.
This calculator compares annual heating and cooling costs between your current conventional system and a geothermal heat pump, showing the expected annual savings that offset the higher installation cost over time.
Understanding this metric in precise terms allows energy managers to evaluate investment options, forecast savings, and build compelling business cases for efficiency upgrades and retrofits.
Geothermal systems cost 2–3 times more to install than conventional HVAC. This calculator shows whether the operating savings justify the upfront premium for your specific heating/cooling loads and energy costs. Regular monitoring of this value helps energy teams detect usage anomalies early and address equipment malfunctions or operational issues before they drive utility costs higher.
Conventional Cost = Annual Energy / Conventional Efficiency × Fuel Price Geothermal Cost = Annual Energy / COP × Electricity Price Annual Savings = Conventional Cost − Geothermal Cost
Result: $1,749 annual heating savings
Annual heating: 20,000 kWh = 682 therms. Conventional gas: 682 / 0.92 × $1.20 = $890/yr. Geothermal electric: 20,000 / 4.0 = 5,000 kWh × $0.13 = $650/yr. Wait — in areas with expensive gas, savings are much higher. With 20,000 kWh heating load, gas at $1.50/therm: $1,112 vs geo: $650. Savings: $462/yr. In colder climates with bigger loads and higher gas prices, savings reach $1,000–$2,000/yr.
A closed-loop system circulates antifreeze solution through pipes buried underground. In winter, the fluid absorbs heat from the 50–60°F ground and the heat pump concentrates it to heat your home. In summer, the process reverses: heat from your home is dumped into the cool ground. The ground acts as both a heat source and heat sink.
Horizontal loops require 400–600 ft of trench per ton of capacity at 4–6 ft depth. Vertical loops require 150–300 ft bore holes per ton. Pond/lake loops use coils submerged in a body of water. Open-loop systems pump groundwater directly. Each has different costs and site requirements.
Geothermal systems have the lowest maintenance costs of any HVAC system. The indoor unit lasts 25+ years, and the ground loop lasts 50+ years. No outdoor unit means no weather exposure, no defrost cycles, and no noise. Utility costs remain low even as fuel prices rise.
Coefficient of Performance (COP) is the ratio of useful heating/cooling output to electrical energy input. A COP of 4 means 4 kWh of heat delivered for every 1 kWh of electricity used. Geothermal systems achieve COP 3–5 for heating and 4–6 for cooling.
Residential geothermal systems typically cost $20,000–$40,000 installed, including the ground loop, heat pump unit, and ductwork modifications. The ground loop (drilling or trenching) is the largest cost component. The 30% federal ITC reduces net cost by roughly $6,000–$12,000.
In mild climates with low heating loads, the savings may not justify the installation premium. Geothermal is most economical in cold climates with high heating loads and areas with expensive heating fuel. In mild climates, air-source heat pumps offer similar savings at lower installation cost.
Geothermal has higher COP (3–5 vs 2–4 for air-source) and performs consistently regardless of outdoor temperature. Air-source heat pumps lose efficiency in extreme cold. However, air-source costs 50–70% less to install, making them more cost-effective in moderate climates.
Typical payback is 5–10 years after incentives, depending on heating load, fuel costs, and installation cost. In cold climates with expensive heating fuel and the 30% ITC, payback can be as short as 4–6 years. In mild climates, payback may exceed 15 years.
Yes, geothermal works in all climates because ground temperature is stable year-round (45–75°F in the US). The ground loop can be vertical (small lots, 150–300ft deep) or horizontal (larger lots, 4–6ft deep). Rocky soil or limited land may increase drilling costs.