Dual-fuel (hybrid) heat pumps
A dual-fuel system gives you an efficient heat pump for most of the year and a gas furnace for the coldest days — the best of both.
How a dual-fuel system works
A dual-fuel (or "hybrid") system combines an electric heat pump with a gas furnace on the same ductwork. In mild and moderate weather, the efficient heat pump heats your home; when it gets very cold, the system automatically switches to the furnace, which delivers strong heat at low cost in deep cold.
The switchover (balance) point
A thermostat or outdoor sensor sets a switchover temperature — your economic balance point — below which the furnace takes over. Above it, the heat pump runs; below it, the furnace runs. This avoids relying on expensive electric strip heat and keeps running costs low year-round. Estimate yours with our balance point calculator.
Cost and who it suits
Because you install two heating sources, upfront cost is higher — often $8,000–$18,000+. It suits cold-climate homes that already have (or want) gas, where you want heat pump efficiency without worrying about the coldest nights.
Pros and cons
Pros: efficient most of the year, reliable in extreme cold, lower running cost than strip-heat backup, adds AC. Cons: higher upfront cost (two systems), still uses some gas, and needs proper switchover setup.
Frequently asked questions
What is a dual-fuel heat pump?
A hybrid system pairing a heat pump with a gas furnace. The heat pump heats in mild weather; the furnace takes over on the coldest days.
Is a dual-fuel system worth it?
In cold climates with gas available, often yes — you get heat pump efficiency most of the year and dependable furnace heat in deep cold, avoiding costly electric backup.
At what temperature does a dual-fuel system switch to gas?
At its switchover (balance) point — commonly in the 25–35°F range, set so the cheaper source runs at each temperature.
Related
Sources & further reading
Educational guide, reviewed against US DOE & ENERGY STAR guidance and updated June 2026. Estimates only — not a substitute for a professional assessment or Manual J load calculation.