Heat pump savings calculator

How heat pumps work: the physics of moving heat

A heat pump does not generate heat the way a gas furnace or electric resistance heater does. Instead, it moves heat from one location to another using a refrigerant cycle - the same thermodynamic process your refrigerator uses to keep food cold. In winter, the heat pump extracts thermal energy from outdoor air (or the ground) and transfers it inside your home. In summer, it reverses the cycle and moves heat from inside to outside, functioning as an air conditioner.

The saving depends entirely on what you run now, and the heating cost calculator gives that figure on its own for any of the seven systems.

This heat-transfer process is significantly more efficient than generating heat from scratch. The metric used to describe this efficiency is the Coefficient of Performance (COP) - the ratio of heat energy delivered to electrical energy consumed. An electric resistance heater has a COP of exactly 1.0: you put in 1 kilowatt-hour of electricity and get 1 kWh of heat. A modern air-source heat pump achieves COPs of 2.5 to 4.5 depending on outdoor temperature. That means for every 1 kWh of electricity consumed, you get 2.5 to 4.5 kWh of heating - a 250–450% efficiency gain over resistance heating.

The COP declines as outdoor temperatures fall, because there is less heat energy in cold air to extract. This is why traditional heat pumps struggled in very cold climates. Modern cold-climate heat pumps use variable-speed compressors and advanced refrigerant circuits to maintain useful COPs even at temperatures of -15°F (-26°C), eliminating the cold-climate limitation for most of North America.

Heating seasonal performance factor (HSPF)

Because a heat pump's COP varies with outdoor temperature throughout a heating season, manufacturers use the Heating Seasonal Performance Factor (HSPF) to describe seasonal efficiency. HSPF is the total heating output over a season divided by the total electrical energy input - a real-world efficiency metric. The updated HSPF2 standard (effective January 2023) uses a more realistic test procedure. A good standard heat pump scores HSPF2 7.5–9.0; a cold-climate model reaches HSPF2 9.0–14.0. Higher is better.

SEER and cooling efficiency

For cooling, heat pump efficiency is measured by the Seasonal Energy Efficiency Ratio (SEER2), which describes cooling output per unit of electrical energy across a cooling season. Minimum federal SEER2 standards as of 2023 are 13.4 (North) and 14.3 (South). Premium models reach SEER2 20–30. A heat pump with SEER2 18 uses about 35% less electricity for cooling than a baseline SEER2 13.4 system.

Air-source vs. geothermal heat pumps: which is right for you?

Heat pumps come in two main categories: air-source (which exchange heat with outdoor air) and geothermal, also called ground-source (which exchange heat with the earth). Both deliver remarkable efficiency compared to combustion systems, but their cost, performance characteristics, and installation requirements differ substantially.

Air-source heat pumps

Air-source heat pumps are the most widely installed type in North America. A single outdoor unit houses the compressor and exchanges heat with the air. The indoor unit distributes conditioned air through your existing ductwork, or in the case of a ductless mini-split, delivers air directly through wall-mounted air handlers. Installation is straightforward compared to geothermal and costs $8,000–$18,000 for a full home system.

The primary limitation of standard air-source units is reduced efficiency at very low outdoor temperatures. Below about 35°F, older models lose a significant fraction of their heating capacity and efficiency. Cold-climate heat pumps - sometimes marketed as "hyper-heat," "H2i," or "Neura" models - address this limitation with variable-speed inverter compressors that maintain efficiency down to -13°F to -22°F. Brands including Mitsubishi, Daikin, Bosch, Trane, and Carrier all offer cold-climate models.

Geothermal (ground-source) heat pumps

Geothermal systems use a buried loop of pipes circulating fluid to exchange heat with the earth. Because ground temperatures at depths of 6–10 feet remain relatively constant at 45–60°F year-round in most of the US, geothermal systems maintain high and stable COPs regardless of outdoor air temperature. Heating COPs of 4.0–5.5 are typical, compared to 2.5–3.5 for air-source in cold climates.

The trade-off is upfront cost. Ground loop installation - whether horizontal trenches, vertical bore holes, or pond/lake loops - adds significant expense. Full geothermal system installation typically costs $15,000–$30,000 or more. The higher efficiency means lower operating costs, but payback periods are longer. Geothermal makes the most financial sense in areas with expensive electricity (where every efficiency improvement matters) or in locations where ground conditions favor horizontal loops (reducing drilling costs).

Ductless mini-split systems

Ductless mini-splits are air-source heat pumps that do not require existing ductwork. Each zone has a small wall-mounted or ceiling-cassette air handler connected to an outdoor compressor by refrigerant lines and a conduit. They are ideal for home additions, older homes without ducts, or for supplemental heating and cooling in specific rooms. Multi-zone systems allow up to 8 indoor units connected to a single outdoor unit, each with independent temperature control. Typical costs are $3,000–$6,000 per zone installed.

Mini-splits often achieve the highest efficiency ratings among all heat pump types - many reach SEER2 22+ and HSPF2 11+ - because they eliminate the 20–30% energy losses common in leaky duct systems. If your existing ducts are in poor condition, a mini-split system may actually outperform a ducted heat pump despite apparently lower equipment ratings.

The federal credit has ended: what is left

The federal Energy Efficient Home Improvement Credit, section 25C, ended for heat pumps placed in service after December 31, 2025, according to the IRS. This calculator used to take up to $2,000 off the cost for it and no longer does. If a quote or an older article still subtracts that credit, add it back before you compare.

State and utility rebates

Many electric utilities and state energy offices still pay toward heat pumps, and some programs are limited by income or require a cold-climate model. Amounts change often, so use the ENERGY STAR Rebate Finder at energystar.gov and your utility's website rather than a figure from an article. If you confirm a rebate, take it off the installed cost you type into the calculator.

Cold-climate heat pumps and dual-fuel systems

The most common objection to heat pumps is performance in cold weather. This concern is valid for older or standard-efficiency models, but modern cold-climate heat pumps have fundamentally changed the picture. Brands such as Mitsubishi (H2i series), Bosch (IDS2 series), Daikin (Aurora series), and Carrier (Performance series) all offer systems with rated heating operation down to -13°F to -22°F, with meaningful capacity and COP retained throughout.

At 5°F outdoor temperature, a quality cold-climate heat pump typically delivers a COP of 1.8–2.5 - still nearly double the efficiency of electric resistance heat. Even in the coldest US climates outside of Alaska, hours below 0°F are relatively few, so the seasonal average COP remains well above 2.0. The Northeast Energy Efficiency Partnerships (NEEP) maintains a database of tested cold-climate heat pump performance at specific outdoor temperatures to help homeowners in the Northeast and Midwest make accurate comparisons.

Dual-fuel systems: the best of both worlds

A dual-fuel (also called hybrid) system pairs an electric heat pump with a gas furnace as a backup. The system runs the heat pump when it is more cost-effective - typically above 25–35°F when the heat pump COP is high and electricity delivers cheaper BTUs than gas. When temperatures drop below the "balance point" (or when gas becomes cheaper per BTU at low temperatures), the system automatically switches to the gas furnace.

Dual-fuel systems are an excellent strategy in areas with cold winters and relatively low natural gas prices. They provide the efficiency benefits of a heat pump for the majority of hours in the heating season while preserving gas furnace reliability for the coldest days. They require a compatible variable-speed gas furnace and a thermostat with dual-fuel logic. Installation typically costs $500–$2,000 more than a heat pump alone due to the added gas furnace component (or reuse of an existing furnace).

When a heat pump may not be the right choice

Despite their efficiency advantages, heat pumps are not the optimal choice in every situation. Understanding the conditions where heat pumps underperform financially helps set realistic expectations and prioritize upgrades effectively.

Very low natural gas prices combined with high electricity rates

The economics of a heat pump depend heavily on the ratio of your electricity rate to your gas rate. The break-even point: a heat pump with COP 3.0 delivers 3 × 3,412 = 10,236 BTU of heat per kWh of electricity, while a 95% efficient gas furnace delivers 100,000 × 0.95 = 95,000 BTU per therm. Gas is the cheaper fuel below the price at which those two cost the same per BTU delivered. At $0.18/kWh electricity, that is $0.18 ÷ 10,236 × 95,000 = $1.67/therm. If your gas rate is $1.00/therm and electricity is $0.20/kWh, a gas furnace may actually be cheaper to operate despite the heat pump's higher COP. Run the numbers for your actual rates before assuming a heat pump saves money.

Poor insulation and air sealing

Heat pumps work best in well-insulated, air-sealed homes. A leaky home with poor insulation requires more heating and cooling equipment capacity, drives more heat pump cycling, and reduces efficiency. If your home scores poorly on a blower door test or has significant insulation gaps, address weatherization first. Reducing your heating and cooling load through insulation and air sealing improvements often delivers better short-term ROI than a new heat pump, and also reduces the size (and cost) of heat pump you need.

Recently installed high-efficiency gas furnace

If you replaced your furnace within the last 5 years with a 95% AFUE condensing model, the remaining useful life of that system may make immediate heat pump replacement a poor financial decision. In this case, consider a mini-split for supplemental heating and cooling in specific zones, deferring a full heat pump replacement until your furnace reaches end of life, and maximizing available weatherization and insulation improvements in the interim.

Very mild climates with few degree days

In climates where both heating and cooling demands are minimal - fewer than 2,500 combined HDD and CDD - annual HVAC costs are low regardless of system type. The absolute dollar savings from a heat pump upgrade may be too small to justify the investment. In such climates, targeted improvements (insulation, window upgrades) and a smaller system investment such as a single mini-split for primary living areas may offer better value.

Installation considerations and common mistakes

Getting the right system size

Proper sizing is critical for heat pump performance and longevity. An oversized heat pump short-cycles - turning on and off frequently rather than running at steady state. Short cycling reduces efficiency, increases compressor wear, and produces poor humidity control in cooling mode. An undersized system runs continuously on the coldest days and may not meet your comfort needs.

Proper sizing requires an ACCA Manual J load calculation - a detailed analysis of your home's insulation levels, window areas, infiltration rate, orientation, and local climate data. Avoid contractors who size equipment based solely on square footage rules of thumb. Many homes built before 2000 have been overbuilt with HVAC equipment, and right-sizing a heat pump replacement to current conditions can save significant money on both equipment and operating costs.

Electrical panel considerations

Heat pumps require dedicated electrical circuits. Most whole-home air-source heat pumps need a 240V circuit at 30–60 amps depending on system capacity. If your home has an older 100-amp electrical panel, a panel upgrade to 200 amps may be required, adding $1,500–$4,000 to installation costs. Budget for this possibility when obtaining contractor quotes. Ask your utility whether a panel upgrade qualifies for any rebate where you live.

Ductwork condition

If you are replacing a central furnace with a ducted heat pump, have the ductwork inspected before installation. Leaky ducts can lose 20–30% of conditioned air before it reaches living spaces. Heat pumps operate at lower air temperatures than furnaces in heating mode (90–100°F supply air vs. 120–140°F for a furnace), which means existing ducts sized for a furnace may need to be rebalanced or expanded for the heat pump to deliver adequate comfort. Duct sealing and insulation may qualify for utility rebates in your area.

Refrigerant and environmental considerations

Modern heat pumps use HFC refrigerants (R-410A) or newer, lower-global-warming-potential alternatives such as R-32 and R-454B. Some manufacturers are transitioning to R-32 and R-466A refrigerants with significantly lower GWP. Refrigerant handling requires EPA Section 608 certification. Ask your contractor about the refrigerant used and whether the system is designed for future refrigerant transitions.

Pro tips for maximizing heat pump savings

Look for every local incentive

With the federal credit gone, the money left is local. Use the ENERGY STAR Rebate Finder, DSIRE (Database of State Incentives for Renewables and Efficiency) and your utility's website to find what applies before you sign, because some programs need approval before the work starts.

Pair with a heat pump water heater

A heat pump water heater uses the same refrigerant-cycle technology to heat water at 3–4× the efficiency of a resistance electric water heater, and some utilities pay toward one. A heat pump water heater typically saves $300–$500 per year on water heating, with payback periods of 3–5 years.

Use a heat pump-optimized thermostat

Standard thermostats can activate the emergency/auxiliary heat strip in a heat pump system unnecessarily, dramatically increasing electricity costs. Use a thermostat with heat pump logic - Ecobee, Honeywell T6 Pro, and Nest thermostats all support heat pump mode. Set emergency heat to activate only when the outdoor temperature falls below your heat pump's rated minimum operating temperature, not as a comfort override. Intelligent temperature setback schedules that avoid large temperature swings (which trigger aux heat) can reduce heat pump operating costs by 10–20%.

Schedule annual maintenance

A heat pump works both as your heating and cooling system, running year-round in many climates. Annual professional maintenance - cleaning the outdoor coil, checking refrigerant charge, lubricating fan bearings, inspecting electrical connections, and testing defrost cycle operation - maintains efficiency and extends equipment life. Dirty coils reduce heat exchange efficiency and can increase operating costs by 10–25%. Replace or clean air filters monthly during peak seasons; a clogged filter reduces airflow and forces the compressor to work harder.