Dual Fuel Heat Pumps: The Best of Gas and Electric?

Dual fuel, sometimes called a hybrid system, pairs an electric heat pump with a gas furnace. The heat pump does most of the heating and all of the cooling. The furnace takes over only when it's colder than a set switchover point.

How it works

A smart thermostat or control board watches the outdoor temperature. Above the switchover point, the heat pump runs. Below it, the furnace runs instead. You get efficient heat most of the year and strong gas heat on the coldest days.

Why people choose it here

• You already have a newer gas furnace and just need to replace the AC. Swapping the AC for a heat pump turns your system into dual fuel.
• You live in an east wind zone and want gas as backup.
• You want to cut gas use without giving it up completely.

What to ask your installer

• Where will the switchover temperature be set, and why?
• Is the existing furnace compatible with the heat pump coil and controls?
• Which thermostat will manage both, and can I adjust the switchover myself?
• Do any utility incentives apply to this setup?

Dual fuel vs all-electric

All-electric with a cold-climate heat pump removes gas from the house entirely, which some homeowners want. Dual fuel keeps a gas bill and a gas appliance to maintain. Both are solid in the valley. The right pick depends on your furnace's age, your rates and how you feel about gas. Compare heat pump vs furnace.