Heat Pump Savings Calculator

How a heat pump works (and why it's so efficient)

A heat pump doesn't generate heat the way a furnace or a toaster does. It moves heat from one place to another using a refrigeration cycle — the same physics as your refrigerator or air conditioner, just run to warm a house instead of cool a box. Even when the outside air feels bitterly cold, it still contains a large amount of thermal energy. A heat pump absorbs that energy into a cold refrigerant, compresses the refrigerant to raise its temperature, and releases the concentrated heat indoors.

Because the electricity is only used to run the compressor and fans — not to create the heat itself — a heat pump delivers far more heat energy than the electrical energy it consumes. The ratio of heat-out to electricity-in is the COP, or Coefficient of Performance. A COP of 3 means 3 units of heat for every 1 unit of electricity; the other 2 units are scavenged from outdoor air. This is the core reason heat pumps are dramatically cheaper to run than electric resistance heat (COP 1.0) and usually cheaper than burning fuel in an 80-95% efficient furnace.

Heat pump vs gas furnace: the real cost comparison

The "which is cheaper" question has no universal answer — it is a pure math problem driven by two local numbers: your gas price per therm and your electricity price per kWh. A high-efficiency gas furnace converts about 90% of its fuel into heat (AFUE 90%). A heat pump with COP 3 converts 1 kWh into the equivalent of about 3 kWh of heat. So the comparison comes down to whichever fuel delivers a unit of usable heat more cheaply.

As a rough crossover: when electricity is under about $0.18/kWh and gas is over about $1.40/therm, the heat pump wins on running cost. When gas is dirt cheap (under $1/therm, common in some producing regions) and electricity is expensive (over $0.25/kWh), the gas furnace can be cheaper to run. The calculator above does this comparison exactly, for your rates and home. For heating oil and propane — both expensive per BTU — the heat pump almost always wins on running cost, often by $500-$1,500 per year.

The IRA 30% tax credit (available through 2032)

The Inflation Reduction Act created a residential clean energy tax credit (Section 25D) that covers 30% of the installed cost of a heat pump, up to $2,000 per year, with no income limits. It is a non-refundable federal credit, meaning it reduces the federal income tax you owe dollar-for-dollar (if your tax liability is below $2,000 you only benefit up to what you owe that year, but unused portions of 25D cannot be carried forward — so plan around your tax situation). The credit is currently scheduled to remain available through 2032.

This calculator applies the 30%-up-to-$2,000 credit automatically when computing payback. Many states and utilities also offer additional rebates (sometimes $1,000-$8,000 for income-qualified households under the HEEHRA program) that stack on top of the federal credit, which can push payback under 5 years even in gas-friendly regions. Always check dsireusa.org and your utility's website for stacking incentives in your area.

Cold-climate heat pumps: 2026 reality vs old myths

The most stubborn myth in home heating is that "heat pumps don't work when it gets really cold." This was reasonable advice in the 1990s, when single-stage units lost nearly all capacity below 35°F and relied on resistance backup strips that erased the savings. It is no longer true. Modern cold-climate heat pumps — identified by an HSPF2 rating near or above 9, or manufacturer ratings down to -13°F (-25°C) — use variable-speed inverter compressors that maintain most of their heating capacity well below freezing.

Field studies from the northeast United States (Massachusetts, Maine, Vermont) and from Scandinavia (where heat pumps are the dominant heating choice in climates harsher than most of the U.S.) show cold-climate units reliably and efficiently heating homes down to roughly -5°F to -15°F. COP drops as the outdoor temperature falls — a COP 4 unit at 47°F might deliver COP 2 at 5°F — but it is still moving heat, not burning fuel to make it from scratch, so it remains cheaper to run than resistance heat. If you live in a cold region, use a COP of 2.5-3.0 in the calculator and select the Cold climate zone for a realistic estimate.

When a heat pump does NOT save money

It would be dishonest to pretend a heat pump is always the cheaper option. There are real scenarios where the running cost is higher than your current system, and the calculator will flag them with a red verdict. The classic losing combination is cheap natural gas + expensive electricity: imagine gas at $0.90/therm and electricity at $0.28/kWh. Under those rates, a 95% gas furnace delivers heat for less per BTU than even a COP-3.5 heat pump. In that specific case the heat pump still cuts CO₂ (especially if your grid is clean), but it won't pay back on dollars alone within the unit's lifetime.

Other situations that shrink or eliminate savings: a very tight, already-efficient home with low heating demand (less energy to displace means slower payback); an oversized, overpriced install quote; or a climate so mild that heating load is tiny and the install cost never amortizes. The calculator's red banner tells you honestly when the math doesn't work — and the 10-year net savings figure shows you exactly how far underwater you'd be.

How to get an accurate quote (and what a Manual J is)

This tool gives you a planning estimate in 30 seconds. A real purchase decision should be based on actual quotes, and the single most important thing to ask a contractor for is a Manual J load calculation. Manual J is the industry-standard method (published by ACCA, the Air Conditioning Contractors of America) for sizing HVAC equipment to a specific home. It accounts for your insulation levels, window area and orientation, air leakage, local climate data, and number of occupants to compute the exact heating and cooling load your system must meet.

A contractor who sizes equipment by "rule of thumb" (e.g., tons per square foot) is likely to oversize — which causes short-cycling, poor dehumidification, and wasted money — or undersize, leaving you cold on the worst day. Get at least two quotes from installers who will run a Manual J, and compare not just price but the equipment brand, COP/HSPF2 rating, warranty, and whether the quote includes any ductwork modifications. The IRA credit and local rebates usually require specific equipment on the CHPA-qualified list, so confirm eligibility before signing.