Heat Pump vs Gas Furnace in New Jersey: Running Cost, Install Cost and Comfort
For most New Jersey homes, a modern heat pump will cost more to install than a like-for-like gas furnace swap but can cost about the same or less to run, especially if you also need air conditioning. A gas furnace usually wins on upfront price and on raw heat output during the coldest snaps; a heat pump wins on efficiency, one-system heating and cooling, and steadier comfort. The right answer for your house depends on your gas and electric rates, the age of your ductwork and AC, and how well the home holds heat, so this guide shows you how to compare the two honestly.
How each system makes heat
A gas furnace burns natural gas and blows the heated air through your ducts. Its efficiency is rated by AFUE (Annual Fuel Utilization Efficiency): an 80% AFUE furnace turns about 80% of the fuel's energy into heat for the home, and a high-efficiency condensing model turns more than 90% into usable heat. The federal minimum for most residential gas furnaces is 80% AFUE.
A heat pump does not make heat by burning anything. It uses electricity to move heat from the outdoor air into the house in winter, then runs in reverse to cool the house in summer. Because it moves heat instead of creating it, a heat pump can deliver more heat energy than the electricity it uses. The U.S. Department of Energy (DOE) says modern air-source heat pumps can reduce electricity use for heating by roughly 50% compared with electric furnaces and baseboard heaters.
Running cost: how to compare your own numbers
Gas and electric prices in New Jersey change from month to month and differ between utilities and supply contracts, so any single "heat pump saves X dollars" figure will be wrong for many homes. You can make a fair comparison yourself with two numbers from your bills: your all-in cost per therm of gas and your all-in cost per kilowatt-hour of electricity (total bill divided by usage, so delivery charges are included).
- Gas furnace cost per 100,000 BTU of heat delivered = price per therm ÷ furnace AFUE. One therm holds 100,000 BTU. An 80% furnace needs 1.25 therms to deliver 100,000 BTU; a 95% furnace needs about 1.05.
- Heat pump cost per 100,000 BTU of heat delivered = (100,000 ÷ 3,412) × price per kWh ÷ the heat pump's average efficiency (its coefficient of performance, or COP). One kWh equals 3,412 BTU, so 100,000 BTU of heat is about 29.3 kWh of energy before the heat pump's efficiency multiplier.
A COP of 3 means the unit delivers three units of heat for each unit of electricity. Real seasonal COP depends on the model, how it is sized and installed, and the weather, and it falls as outdoor temperatures drop. Ask any installer for the expected seasonal performance of the specific equipment they quote, then run both sums with your own rates.
Two things change the picture for many New Jersey households:
- You may already be paying for cooling. If your central air conditioner is near the end of its life, a heat pump replaces both the AC and the furnace's heating role. The fair comparison is "new furnace plus new AC" against "one heat pump," not furnace against heat pump alone.
- Gas has a fixed monthly charge. If going all-electric lets you close the gas account entirely, that fixed customer charge disappears. If you still cook or heat water with gas, it stays.
DOE has also published analysis finding that, for over 90% of the American households it assessed, replacing worn-out heating equipment with the right heat pump, one matched to the home's needs, would lower energy bills. That is a national finding, not a promise for your house, which is why the bill-based comparison above matters.
Install cost: what drives the price
We will not quote typical prices here, because install cost varies widely with the home, and an honest quote needs a site visit and a heat-loss calculation. These are the factors that move the number for both options:
- Ductwork condition and size. Heat pumps deliver air that is warm but not as hot as a gas furnace's, so they move more air to provide the same heat. Undersized or leaky ducts may need work.
- Electrical capacity. A heat pump adds electrical load. Some older homes need a panel or circuit upgrade; a gas furnace swap rarely does.
- Whether you need cooling too. A furnace-only replacement is usually the lowest upfront option. Once a new AC is added, the gap with a heat pump narrows.
- Equipment tier. Variable-speed, cold-climate heat pumps cost more than basic single-stage units, just as modulating condensing furnaces cost more than 80% AFUE models.
- Incentives. New Jersey utilities run heat pump rebate programs, and terms change. We explain one of them in our guide to PSE&G heat pump rebates. Always confirm current amounts and eligibility on your utility's own program page before you sign. Note that the federal $2,000 heat pump tax credit is no longer available for systems installed in 2026.
Comfort: what living with each feels like
Gas furnaces heat in bursts. They push very warm air, shut off, and let the house cool before firing again, which some people like because the vents feel hot.
Heat pumps, especially inverter-driven models, tend to run longer at lower output. The air from the vents feels warm rather than hot, but room temperatures stay steadier, with fewer swings. Many homeowners notice quieter operation and more even temperatures between floors once they get used to the different feel.
In summer, a heat pump is simply a high-efficiency air conditioner, so cooling comfort is the same as or better than a standard central AC.
The honest downsides of each
Heat pump
- Standard (non cold-climate) heat pumps lose capacity as it gets colder. DOE notes that the heating efficiency of standard central air-source heat pumps drops below about 35°F, so a backup heat source is often needed in cold climates.
- Backup electric resistance heat, if it runs often, is expensive. Correct sizing and a cold-climate model reduce how often it comes on.
- Higher upfront cost if you only need to replace the furnace and your AC is fairly new.
- The outdoor unit runs defrost cycles in winter, which can look like steam and briefly pause heating. This is normal.
Gas furnace
- Heating only. You still need a separate air conditioner.
- Exposure to gas price swings and the fixed monthly gas charge.
- Combustion appliances need venting and carbon monoxide safety checks.
- Lower efficiency ceiling: even the best furnace cannot deliver more heat than the fuel contains.
Can a heat pump really handle a New Jersey winter?
Yes, when the equipment is chosen for the climate. Cold-climate heat pumps are designed to keep heating well below freezing; a 2025 field study by the National Renewable Energy Laboratory of inverter-driven heat pumps in cold climates documented units operating at sub-zero Fahrenheit temperatures. New Jersey winters are milder than the places those units are tested in, but cold snaps still happen, so sizing to your home's actual heat loss matters more than the label on the box. Our article on whether heat pumps work in New Jersey winters goes into more detail.
Is there a middle option?
Yes. A dual-fuel (hybrid) setup pairs a heat pump with a gas furnace. The heat pump handles cooling and most of the heating season, and the furnace takes over on the coldest days or when gas is the cheaper fuel at that temperature. It suits homes with a newer furnace, homes where a full electrical upgrade is costly, and owners who want gas as a backstop. The trade-off is keeping two systems and the gas account.
Quick comparison
| Factor | Heat pump | Gas furnace |
|---|---|---|
| Heating and cooling | Both in one system | Heating only; needs separate AC |
| Upfront cost (furnace only) | Usually higher | Usually lower |
| Upfront cost (when AC also needs replacing) | Gap narrows | Furnace plus AC |
| Running cost | Depends on electric rate and seasonal efficiency | Depends on gas rate and AFUE |
| Feel of the heat | Steady, warm air | Hot bursts of air |
| Coldest days | Needs a cold-climate model or backup | Full output |
| Fuel on site | None | Natural gas, combustion venting |
Frequently asked questions
Is a heat pump cheaper to run than a gas furnace in New Jersey?
It can be, but it depends on your gas and electric rates and on the heat pump's real-world efficiency. Divide your gas price per therm by the furnace's AFUE, and compare it with 29.3 kWh times your electric rate divided by the heat pump's seasonal COP.
Do I need backup heat with a heat pump in NJ?
Many standard heat pumps use backup heat in cold weather. A correctly sized cold-climate heat pump needs it far less often, and a dual-fuel system uses a gas furnace as the backup.
Should I replace my furnace and AC at the same time?
If both are aging, replacing them together with one heat pump is usually the best value comparison, because one system takes over both jobs.
Is the federal heat pump tax credit still available?
No. The federal $2,000 heat pump tax credit does not apply to systems installed in 2026. Utility rebates in New Jersey are separate, so check your utility's current program page.
Will a heat pump work with my existing ducts?
Often, yes, but heat pumps move more air than furnaces at lower temperatures, so ducts should be checked for size and leaks during the quote.
Related services
- Heat pump installation: sized to your home's heat loss for New Jersey and New York winters.
- Central HVAC replacement: for homes comparing a new furnace and AC with a heat pump.
- Financing: monthly payment options to spread the cost of a new system.
Get a straight comparison for your home
Every home is different, and the right choice comes down to your rates, your ducts and how your house holds heat. Book a free consultation with Summit Air Heating & Cooling and we will assess your home, explain the heat pump and furnace options side by side, and give you a clear, written quote with no pressure.
