Comparison
Dual fuel vs heat pump
Same heat pump. The question is what covers the coldest hours: a gas furnace or electric backup.
Written by HYRE HVAC Research Desk Primary-source research, data analysis and fact checking
The short answer
Dual fuel vs heat pump is a question about backup heat. A dual-fuel system pairs an electric heat pump with a gas or propane furnace.
The heat pump heats most of the year, and the furnace takes over when outdoor temperatures fall below a set switchover point. An all-electric heat pump system uses electric resistance strips for backup instead.
Dual fuel suits cold climates with gas already in the house; all-electric suits milder climates or homes without gas.
How does a dual-fuel system decide which heat to use?
A dual-fuel control or thermostat watches outdoor temperature. Above a switchover point, often called the balance point, the heat pump runs. Below it, the furnace runs and the heat pump stops. The two never heat at the same time, because the furnace would push hot air across the heat pump’s indoor coil.
The switchover can be set on comfort (when the heat pump can no longer keep up) or on economics (when gas becomes cheaper per unit of heat than the heat pump’s electricity). The economic point depends on your local gas and electricity prices and the heat pump’s efficiency at low temperatures.
An all-electric heat pump system uses electric resistance strips in the air handler as backup and during defrost. Strips are simple and reliable, but they use much more electricity per unit of heat than the heat pump itself.
Dual fuel vs all-electric heat pump at a glance
| Dual fuel | Heat pump with electric backup | |
|---|---|---|
| Main heat | Heat pump | Heat pump |
| Backup heat | Gas or propane furnace | Electric resistance strips |
| Needs gas | Yes | No |
| Combustion safety | Furnace venting and CO alarms | None from the system |
| Deep-cold running cost | Set by gas price and furnace AFUE | Set by electricity price; strips are costly to run |
| Controls | Needs a dual-fuel thermostat or control board | Standard heat pump thermostat |
| Equipment | Outdoor heat pump, furnace, matched coil | Outdoor heat pump, air handler with strips |
Check the matched-system rating for the heat pump and coil, and the furnace AFUE, in the AHRI Directory.
What drives the cost of each?
If you already have a sound gas furnace, dual fuel can mean adding a heat pump in place of the AC and keeping the furnace, which is a smaller job than replacing both.
If the furnace is also old, you are buying two heating systems. All-electric needs an air handler with strips and enough panel capacity to run them.
We publish no prices here: we do not yet hold enough sourced, dated quotes to state one honestly. Use the cost hub and the HVAC cost calculator with your own quotes.
Running costs depend on how many hours fall below the switchover point in your climate. Our degree day lookup and heat pump vs furnace tool help you estimate that with your own prices.
Which one fits?
Choose dual fuel when
Winters are long and cold, with many hours well below freezing.
Gas is already piped in and the furnace is in good shape.
Your gas price is low relative to electricity.
You want heat that does not depend on the heat pump in a cold snap.
Choose an all-electric heat pump when
Winters are mild and backup strips rarely run.
There is no gas service, or you want to remove combustion from the house.
You choose a cold-climate heat pump that holds output at low temperatures, which reduces backup use.
Where each one genuinely wins
Dual fuel wins on deep-cold running cost and resilience where gas is cheap. The heat pump with electric backup wins on simplicity, no venting and no gas bill.
A cold-climate heat pump narrows the gap by keeping more output in low temperatures, so the strips run less. The honest test is your climate and your two fuel prices, not a rule of thumb.
Ask before you choose
Ask whether it is set for comfort or for cost, and how to change it later.
The coil sits on top of the furnace. It must match the heat pump and the furnace blower.
Ask for the capacity figure at your local low temperature.
Gas combustion and venting checks need a licensed technician.
Questions
What is a dual-fuel heat pump?
At what temperature should dual fuel switch to the furnace?
Is dual fuel cheaper than a heat pump alone?
Can I add a heat pump to my existing furnace?
Do I still need CO alarms with dual fuel?
Written and audited by
HYRE HVAC Research Desk
Primary-source research, data analysis and fact checking
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