The quick answer
Quick answer
For most southeastern Wisconsin homes already heated with cheap natural gas, a modern gas furnace — or a dual-fuel pairing — is still the value pick. A cold-climate heat pump genuinely works here and wins outright if you heat with propane or electric resistance, have no gas service, or want heating and cooling in one machine. The deciding factor is your fuel, not the weather.
- Cold-climate heat pumps hold real capacity well below zero — the 'heat pumps don't work in Wisconsin' line is a decade out of date.
- But natural gas at roughly $1.05/therm (WE Energies) is hard to beat on pure operating cost; electricity around $0.18/kWh in winter narrows the heat pump's edge to the shoulder seasons.
- Heating with propane or electric resistance flips the math hard toward the heat pump — those are the homes where it pays for itself fastest.
- A heat pump replaces your AC too. If your furnace AND air conditioner are both old, compare against the combo price, not the furnace alone.
- Run your own numbers in our heat pump calculator — it uses the same 7,300 HDD / 5°F design-temp baseline Shane uses on a sales call.
The decision factors
What fuel you heat with today
Natural gas customers have the cheapest heat per BTU in the state, so a heat pump competes on comfort and consolidation, not savings. Propane and electric-resistance homes pay two to four times more per unit of heat — for them a cold-climate heat pump is usually an immediate monthly win.
Whether your AC is also due
A heat pump is an air conditioner with a reversing valve. If your AC is on its last legs anyway, the heat pump's premium shrinks to the difference over a new AC — a much easier number to justify than heat pump vs furnace alone.
Your home's electrical service
Heat pumps need a dedicated 240V circuit and, for some homes, panel work. Most Waukesha County homes built after the 1980s have the capacity; older 100A panels need a load calculation first — we check during the estimate.
How long you'll own the house
The heat pump's economics build over years of shoulder-season savings and avoided AC replacement. If you're selling within a couple of years, the simpler like-for-like swap usually pencils better.
Gas furnace vs Cold-climate heat pump
| What matters | Gas furnace | Cold-climate heat pump |
|---|---|---|
| Heat output in deep cold | Full output at any outdoor temperature — 5°F design day included | Rated well below 0°F, but capacity tapers as temps drop; sizing and backup strategy matter |
| Operating cost on WE Energies rates | Cheapest heat per BTU in SE Wisconsin at ~$1.05/therm | Wins against propane and electric resistance; roughly break-even to modestly behind natural gas depending on rates |
| Cooling | None — separate AC required | Built in — the same machine cools in July |
| Equipment lifespan pattern | 15–20+ years, runs only in winter | Runs year-round (heating + cooling), so it accumulates hours faster |
| Rebates | Focus on Energy rebates for qualifying high-efficiency models | Focus on Energy rebates for qualifying cold-climate models — verify current program terms before you count on a number |
| Permits | WI mechanical permit — we pull it | WI mechanical permit + electrical work — we pull it |
The Wisconsin reality check
Waukesha County runs about 7,300 heating degree days a year with a 5°F design temperature — a serious heating climate. Modern cold-climate heat pumps are rated for it, but physics still applies: as the temperature falls, a heat pump's output drops exactly when your house needs more heat. That's why the honest local answer is so often dual-fuel — heat pump efficiency in the 30s and 40s, gas fire below the crossover point (typically somewhere around 25–35°F depending on your rates).
The homes where we tell people a heat pump is a slam dunk share a profile: propane or electric-resistance heat (common in the towns beyond the gas mains — Eagle, North Prairie, parts of Dousman), an AC that's due anyway, or a homeowner who wants one system doing both jobs. The homes where we tell people to keep it simple share a profile too: newer furnace, cheap gas service, tight budget. Both answers are on this page because both are true.
The honest numbers
These are the planning ranges from our Instant Pricing tool. Note what the heat pump range includes — and that a dual-fuel setup (heat pump + gas furnace backup) prices above the straight heat-pump range.
| Option | Planning range | What that covers |
|---|---|---|
| Furnace replacement | $6,200–$10,600 | New gas furnace installed with permit — 80% AFUE at the low end, 96%+ modulating at the top. |
| Cold-climate heat pump install | $11,500–$17,500 | Cold-climate rated system sized for Wisconsin — rebates may apply. Dual-fuel setups price above this range. |
| Furnace + AC combo (the alternative package) | $5,400–$16,000+ | If both systems are due, this is the number a heat pump should really be compared against. |
Dollar ranges come straight from our published Instant Pricing tool (SE-Wisconsin planning ranges — see the homepage pricing section and Terms §3). Ballparks only, never a quote: your home's specifics set the real number, in writing, before any work begins.
Which one should you choose?
Gas furnace
Choose the gas furnace when
You're on natural gas, your AC still has life in it, and you want the lowest upfront cost and the cheapest BTUs in the state. A like-for-like furnace swap is the fastest, simplest fix for a Wisconsin winter — and nothing heats more stubbornly through a polar vortex than a gas flame.
Cold-climate heat pump
Choose the heat pump when
You heat with propane or electric resistance, you don't have gas service, or your furnace and AC are both due and you'd rather buy one machine than two. It's also the right call if you want to hedge against fuel-price swings — a dual-fuel system lets you burn whichever energy is cheaper that week.
Also consider: dual-fuel — the SE Wisconsin favorite
You don't have to pick a side. A heat pump handling the shoulder seasons with a gas furnace taking over below the break-even temperature is the configuration we recommend most for gas-served homes replacing both systems. See the dual-fuel vs furnace + AC comparison for that decision.
Ready when you are
Get the answer for your house.
Both options priced in writing, sized to your home, explained without a pitch — 24/7, owner-operated, licensed (WI #1482483). Already have someone else's quote? We'll review it for free.
Keep exploring
Next steps
Honest answers, before you decide
Will a heat pump keep up on a -10°F Wisconsin night?
Cold-climate models keep producing heat well below zero, but their capacity shrinks as temperatures fall. A properly sized system carries the house through a design-day cold snap either with reserve capacity, electric backup strips, or — the way we usually spec it here — a gas furnace as the dual-fuel backup. What you should not do is buy a heat pump sized only for the average January day.
Is a heat pump cheaper to run than my gas furnace?
Against natural gas at WE Energies' roughly $1.05/therm, usually not by much — the heat pump wins in mild weather and loses ground in deep cold, which is why dual-fuel exists. Against propane or electric-resistance heat, yes, typically by a wide margin. Our heat pump calculator models your actual fuel, home size, and electric rate.
Do heat pumps qualify for Wisconsin rebates?
Focus on Energy has offered rebates for qualifying high-efficiency heat pumps, and utility programs change year to year. We tell customers the same thing we publish: verify the current program terms before counting on a number, and we'll confirm what applies to your exact equipment during the quote.
What about just adding a heat pump and keeping my furnace?
That's dual-fuel, and it's often the best of both worlds in SE Wisconsin: heat pump comfort and efficiency for most of the season, gas muscle for the cold snaps. It costs more than either single system because you're buying and controlling two heat sources — see our dual-fuel comparison for the honest breakdown.
Reviewed by Shane Herro, Owner & Lead Tech · Last updated 2026-07-14