Heat Pump vs Gas Furnace: Costs, COP and Rebate Eligibility in 2026

Updated September 22, 2026. The examples below are planning scenarios, not monitored installations or local price quotes.

A heat pump can reduce fuel use without necessarily reducing your heating bill. The financial result depends on delivered electricity and gas prices, seasonal efficiency, backup heating, installation cost, and any rebate actually approved for your project. Climate affects those inputs; a climate label alone cannot establish payback.

Start with the same amount of delivered heat

A furnace burns fuel. A heat pump moves heat using electricity. Its coefficient of performance (COP) is delivered heat divided by electricity consumed. COP 3 means three units of heat per unit of electricity. For annual costs, use a seasonal estimate that accounts for your climate and operation, rather than a favorable rating at one outdoor temperature.

To compare both systems against a household's measured gas heating use:

1. Separate space-heating gas from water heating, cooking, and other gas use.
2. Multiply heating therms by 100,000 Btu per therm and the furnace efficiency.
3. Divide by 3,412 Btu per kWh to express delivered heat in kWh.
4. Divide that heat by seasonal COP to estimate heat-pump electricity.
5. Apply the delivered price of each fuel, and compare installation costs separately.

An old furnace and a new furnace can have different efficiencies. If a new furnace is your alternative, recalculate its fuel demand at the proposed efficiency. Do not compare an efficient new heat pump only against an unusually inefficient old system and present the result as a universal replacement decision.

A reproducible heating-cost example

Assume 600 therms per year used for space heating, 80% furnace efficiency, gas at $1.50 per therm, and electricity at $0.18 per kWh. These are chosen example prices, not national averages. Delivered heat is 600 × 100,000 × 0.80 ÷ 3,412, approximately 14,068 kWh per year. Annual gas cost is $900.

Figures are rounded after calculation. The table holds heat demand and prices constant to isolate efficiency. It is not a mapping of these COP values to specific states. Financing, maintenance, cooling, fixed gas charges, and future rate changes are excluded.

Under these assumptions, the break-even seasonal COP is approximately 2.81: 14,068 × $0.18 ÷ $900. Below that value the heat pump costs more to operate; above it, less. At $0.30/kWh with the same gas price and heat demand, the threshold rises to about 4.69. Changing the tariff can change the decision more than a small equipment-efficiency improvement.

Compare installed costs and rebates separately

Suppose an itemized furnace quote is $6,000 and a heat-pump quote is $10,000. At the COP 3 scenario, the additional $4,000 upfront cost is offset by only about $56 annually. Simple payback is roughly 72 years, so heating-bill savings alone would not justify that premium within a normal equipment planning horizon.

A confirmed $4,000 heat-pump rebate would remove that upfront difference in this example. An unapproved rebate should stay at zero in the base case. Include panel upgrades, ductwork, permits, backup equipment, and financing in both quotes. If the heat pump also replaces an air conditioner you already need, compare against the complete furnace-plus-air-conditioning alternative rather than assigning its entire price to heating.

HEAR / HEEHRA: what the federal limits mean

The Home Electrification and Appliance Rebates program is often called HEAR or HEEHRA; DOE also uses High-Efficiency Electric Home Rebate (HEEHR). It is administered through participating states, territories, and Tribes. Availability and reservations must be confirmed locally.

For a qualifying heating/cooling heat pump, the federal ceiling is $8,000. It is not conditional on buying a second upgrade. Under DOE's program requirements, households below 80% of area median income can receive up to 100% of qualified project cost; the moderate-income tier, from 80% to below 150%, can receive up to 50%, subject to the product ceiling. Actual programs may offer less. Other eligible measures have separate caps and a combined household ceiling of $14,000. See DOE requirements, Table 7.

For example, the federal ceiling for a qualifying $10,000 heat-pump project is $8,000 in the lower-income tier, or $5,000 in the moderate-income tier. These are maximum calculations, not approvals or promises of available funding.

Before signing a contract, ask the administrator to confirm your household-size-adjusted income limit, eligible equipment, participating contractor requirements, application timing, funding availability, and stacking restrictions. Do not assume a nationwide union-labor requirement or a fixed labor surcharge. Use the DOE program page to identify the program and contact your state energy office.

What to check in colder weather

Request the proposed model's heating capacity and efficiency at your area's design temperature. Rated capacity at a mild temperature does not establish that the system can carry the full load on a very cold day. Ask for a room-by-room load calculation, the balance point, and a written explanation of auxiliary-heat controls.

Resistance backup has a COP near 1 at the equipment. If 90% of an example 14,068 kWh heat load is served at COP 3 and 10% by resistance heat, electricity use is approximately 5,627 kWh. At $0.18/kWh the bill is $1,013, exceeding the example $900 gas bill. A seasonal COP that already includes backup must not have the same backup penalty added again.

Insulation, air sealing, duct condition, and system sizing influence both heat demand and performance. They need a home-specific assessment. A state-average calculator cannot replace that assessment.

Use the comparison to ask better questions

Bring 12 months of bills and two itemized replacement quotes to the discussion. Run a base case without an unconfirmed rebate, then a separate case with the administrator's written award. Test a higher electricity price and a lower seasonal COP. If the preferred option changes under modest changes, the decision needs better inputs.

Fixed gas service charges disappear only if you can close the gas account. Solar electricity also has an opportunity cost: using it for heating may forgo export credits or other household savings. Count each kWh once.

Use the Heat Pump vs Gas calculator for a planning estimate and the Scenario Comparator to vary annual gas use, prices, and COP. Confirm any rebate separately with its administrator.

Correction: This article replaces unsupported claims about 2,400 monitored installations, universal climate-zone payback, and rebate eligibility. The displayed examples are original arithmetic scenarios with explicit assumptions.