Heating
What Is Dual-Fuel (Hybrid) System?
Definition
A dual-fuel (or hybrid) system pairs a heat pump with a gas furnace in the same ductwork. The heat pump handles heating and cooling most of the year, since it costs less to run in mild weather; the system automatically switches to the gas furnace only when outdoor temperatures drop low enough that gas becomes the more efficient or reliable choice.
Why it matters for your home
You get the heat pump's lower operating cost most of the year without losing the gas furnace's output on the coldest nights — see our full gas furnace vs. heat pump comparison for how the Willamette Valley's mild winters change that math.
What to do about it
Ask what outdoor temperature triggers the switchover on your specific system — a poorly set switchover point can quietly run the more expensive fuel more often than it should.
Related terms
This definition is pending licensed-trade technical review. It's sourced from our own published service and guide content, not invented — but hasn't yet been signed off by a licensed HVAC reviewer.
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