If your home heats with gas, you have two good heat pump paths. Dual-fuel keeps a gas furnace for the coldest hours and lets a heat pump do the rest. All-electric replaces the furnace entirely. The right choice depends on your electrical panel, your ducts, your utility's incentives and whether you plan to keep gas service long-term.
What each option is
A dual-fuel (or hybrid) system pairs an outdoor heat pump with a gas furnace inside. The heat pump heats most of the year and handles all cooling. When it gets cold enough outside, the thermostat switches heating over to the furnace.
An all-electric heat pump system uses an outdoor heat pump with an indoor air handler instead of a furnace. Backup comes from electric heat strips in the air handler, which run only when the heat pump needs help.
Why both work well here
Most of the Puget Sound heating season is mild and damp, which is where heat pumps are most efficient. That's true from Seattle and the Eastside down through Kent, Tacoma and Olympia, and over to Kitsap. Both setups let the heat pump carry the bulk of the load. The difference is what happens during the coldest hours, and what you're left with long-term.
Comparing the two
The main trade-offs:
- Backup heat — dual-fuel uses gas; all-electric uses electric strips.
- Electrical panel — all-electric with heat strips usually needs more panel capacity; dual-fuel often fits an existing panel more easily.
- Gas service — dual-fuel keeps your gas meter and its monthly charges; all-electric can let you drop gas if nothing else uses it.
- Combustion — all-electric has no flue and no carbon monoxide source from heating.
- Incentives — programs differ by utility and can favor one setup over the other.
- Existing furnace — if your furnace is fairly new and healthy, dual-fuel lets you keep it and just add the heat pump.
When dual-fuel tends to fit
Dual-fuel is common in larger Eastside homes in Bellevue, Sammamish and Redmond, and in South King County homes in Kent and Renton, where gas and good ducts are already in place. It's also a practical fix when the panel is near capacity and an upgrade isn't worth it. Owners who like the feel of gas heat on a cold morning often prefer it.
When all-electric tends to fit
All-electric makes sense when the furnace is at end of life anyway, the panel has room (or you're upgrading it), and you want to stop paying for gas service. It's also a natural fit if you're adding solar, or if your gas water heater and range are already electric or due for replacement.
Incentives
Utility incentives can change the math more than any other line item. Seattle City Light and Puget Sound Energy both run heat pump incentive programs, and some Eastside cities add local programs on top. Eligibility depends on your utility, what you're replacing (gas, oil, electric resistance or an older heat pump) and the efficiency rating of the new equipment. We confirm what applies to your home during the estimate, show the price after incentives, and file the paperwork for you. PSE in particular has offered incentives aimed at gas customers adding heat pumps, and terms for dual-fuel and full conversions can differ.
Questions to settle before you choose
How old is your furnace, and is it healthy? What does your electrical panel look like? Do you have other gas appliances you plan to keep? Who is your utility — Seattle City Light, PSE, Tacoma Power, Peninsula Light or another — and what do they offer right now? How long will you stay in the home?
We check the panel and ducts, do a load calculation, and can price dual-fuel and all-electric side by side so you're comparing real numbers.
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