Furnace vs. Heat Pump: A Plain Comparison

Quick answer

A gas furnace burns fuel to make heat, while a heat pump uses electricity to move heat and also cools in summer. Keeping a furnace often makes sense if it's safe and working well. A heat pump often makes sense if you want cooling or heat with electric, oil, or propane. Dual-fuel systems combine both.

Key facts

Furnace heat source	Burns gas (or oil or propane)
Heat pump heat source	Moves heat using electricity
Cooling	Heat pump: yes. Furnace: needs a separate AC.
Combustion in the home	Furnace: yes. Heat pump: none.
Dual fuel	Heat pump paired with a gas furnace
Furnace efficiency rating	AFUE (ENERGY STAR)

What's the difference between a furnace and a heat pump?

A furnace makes heat by burning fuel, usually natural gas. A heat pump doesn't make heat — it moves heat from the outdoor air into your home using electricity and refrigerant. That's why a heat pump can also cool: in summer it runs in reverse, like an air conditioner.

ENERGY STAR describes a ducted heat pump as a central air conditioner that also works in reverse to heat the house. A furnace and a ducted heat pump can use the same ducts. Ductless heat pumps skip the ducts and use indoor heads mounted on walls or ceilings.

Both systems use a blower to push air through your home, and both need clean filters and regular upkeep. The biggest day-to-day differences are the fuel, whether you get cooling, and what tends to go wrong.

How do a furnace and a heat pump compare side by side?

Here's a plain side-by-side. It covers how each one works and what drives its costs — not which one is cheaper for your house. That depends on your home, your equipment, and your energy rates.

Question	Gas furnace	Heat pump
What fuel does it use?	Natural gas (some homes use oil or propane)	Electricity
How is heat made?	Burns fuel and passes the heat to your air through a heat exchanger	Moves heat from outdoor air to indoors with refrigerant
Does it cool?	No. It needs a separate central AC.	Yes. The same system heats and cools.
Is there combustion in the house?	Yes. It must burn cleanly and vent safely.	No. ENERGY STAR notes no direct combustion emissions like carbon monoxide.
What commonly goes wrong?	Igniters, flame sensors, blower motors, pressure switches, venting	Capacitors, fan motors, defrost controls, refrigerant leaks, reversing valves
What affects running cost?	Gas rates, furnace efficiency (AFUE), ducts, air leaks	Electric rates, heat pump efficiency, how often backup heat runs, ducts, air leaks
Does it need backup heat?	No	Often has electric heat strips or a furnace as backup

Not sure what's wrong yet?

Start with the safe checks. Many problems are a setting, a breaker, or a filter.

Find your symptom Compare repair vs. replace

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Sources listed for outside facts

What is a dual-fuel system?

A dual-fuel system pairs a heat pump with a gas furnace. The heat pump handles heating on most days and does all of the cooling. The furnace takes over when the heat pump can't keep up, or when gas costs less to run at that moment.

ENERGY STAR suggests considering a heat pump instead of a new central AC if you have a relatively new furnace and an older AC, or you're adding AC to a furnace. That creates a dual-fuel system for a modest extra cost over an AC alone. It lets you use each system when it makes the most sense on cost.

A thermostat or control decides when to switch. The right switch point depends on your equipment and your energy rates. It should be set up by the installer and checked again if your rates change.

When does keeping a gas furnace make sense?

Keeping a gas furnace often makes sense when it's safe, in good shape, and heating your home well. If a repair will fix the current problem, that's usually the simplest path. Replacing working equipment just to switch fuels is a choice, not a must.

Keeping or repairing your furnace can make sense when:

Your furnace is safe and a repair fixes the current problem.
You already have gas service and like how gas heat feels.
You have a newer furnace and want to add cooling. Pairing it with a heat pump (dual fuel) is worth asking about.
A switch would need big changes to your ducts or electrical service. Ask a technician whether yours would.

When does a heat pump make sense?

A heat pump often makes sense when you want cooling too, or when your current heat is electric resistance, oil, or propane. ENERGY STAR lists lower energy bills when switching from those fuels to a heat pump. It also points to no combustion in the home and no fuel to store or run out of.

A heat pump can be a good fit when:

You want heating and cooling from one system.
You heat with baseboard, wall heaters, an electric furnace, oil, or propane.
Your AC is old and your furnace is newer. Consider dual fuel.
Parts of your home have no ducts. A ductless heat pump can serve them.
Your central AC or furnace needs replacing anyway. ENERGY STAR says a heat pump can often be a drop-in replacement in that case.
You may qualify for a utility incentive (see below).

What affects the cost to run a furnace or a heat pump?

Running cost depends on your energy rates, your equipment's efficiency, and your home. We can't tell you which one is cheaper for your house without looking at those things, and we won't promise savings we can't back up.

These are the things that move the number:

Your gas and electric rates, and how they change over time.
Equipment efficiency. Furnace efficiency is rated by AFUE (ENERGY STAR).
How often a heat pump leans on electric backup heat.
Leaky ducts and air leaks. ENERGY STAR says sealing and insulating ducts can improve system efficiency by as much as 20 percent.
Sizing and installation. ENERGY STAR says poor installation can cut efficiency by up to 30 percent.
Thermostat habits. ENERGY STAR says heat pumps don't save energy with big setbacks, so a steady setting works better.

Are there incentives for switching to a heat pump?

You may qualify for a utility incentive, depending on where you live, how your home is heated now, and what you install. In Oregon, Energy Trust of Oregon offers incentives for some ducted and ductless heat pumps and some high-efficiency gas heating. In Washington, Clark Public Utilities runs programs for heat pumps and ductless heat pumps in some electrically heated homes.

Some programs require a program-approved or network contractor, and rules change. You may qualify — we'll confirm. The federal Energy Efficient Home Improvement Credit ended for equipment placed in service after December 31, 2025. Don't plan a 2026 purchase around it.

Common questions

Is a heat pump cheaper to run than a gas furnace?

It depends on your energy rates, your equipment, and your home, so there's no one answer. ENERGY STAR says switching from electric resistance, propane, or oil heat to a heat pump lowers energy bills. Compared with gas, the answer varies by house and by rates. We won't promise savings we can't back up.

Can a heat pump replace both my furnace and my AC?

Yes, one heat pump can heat and cool. ENERGY STAR says a ducted heat pump can often be a drop-in replacement when a central AC or furnace needs replacing. Many systems include backup heat for the coldest days.

Can I keep my furnace and add a heat pump?

Yes. That setup is called dual fuel. The heat pump handles cooling and most heating, and the furnace takes over when it's very cold or cheaper to run. ENERGY STAR suggests it when you have a relatively new furnace and an older AC.

Is a heat pump safer than a gas furnace?

A heat pump has no combustion, so it doesn't produce carbon monoxide. A gas furnace that's working and venting properly is designed to run safely, but it does burn fuel, so it needs regular safety checks. If a CO alarm ever sounds, get everyone outside into fresh air and call 911.

Does a heat pump need ducts?

No. Ducted heat pumps use ducts like a furnace does. Ductless heat pumps, also called mini-splits, mount indoor heads on a wall or ceiling and need no ducts, according to ENERGY STAR.

Should I replace a working furnace with a heat pump?

Only if you have a reason to, like wanting cooling or planning around incentives. A furnace that's safe and working can keep running, and a repair is often the simpler path. If you're weighing a switch, we'll lay out both options.

Does a heat pump cool as well as a central AC?

A heat pump cools the same way a central air conditioner does. ENERGY STAR describes a ducted heat pump as a central AC that also runs in reverse to heat. How well any system cools depends on sizing, installation, and ducts.