Direct answer, which wins for most Seattle homes
For about 75 percent of Seattle homes facing furnace replacement in 2026, a heat pump is the better financial and comfort decision. The $1,200 PSE rebate stacks with the $2,000 federal IRA tax credit, and the heat pump runs 30 to 40 percent cheaper to operate, which means the higher up-front cost typically pays back within 5 to 8 years. After that you’re saving money for the life of the equipment.
The other 25 percent: homes with existing 8-and-under-year-old gas furnaces (replacement urgency doesn’t exist yet), homes that would need major electrical work to support the heat pump (some older Wallingford or Beacon Hill homes with knob-and-tube and 60A service), and homes where the homeowner explicitly doesn’t want to deal with electric utilities. We’ll explain when each category applies.
The 10-year cost picture, head to head
This is the comparison we run for every furnace replacement consult. Numbers below are for a typical 2,200 sq ft Seattle home replacing a 1998 80% AFUE furnace.
| Cost component | 96% AFUE Gas Furnace | Cold-Climate Heat Pump |
|---|---|---|
| Equipment + install (4-ton equivalent) | $10,500 | $19,400 |
| PSE rebate | -$0 | -$1,200 |
| Federal IRA tax credit (claimed next spring) | -$600 | -$2,000 |
| Net Year 1 cost | $9,900 | $16,200 |
| Operating cost Year 1-10 (PSE Seattle rates 2026) | $1,600/yr × 10 = $16,000 | $1,100/yr × 10 = $11,000 |
| Service / maintenance Year 1-10 | $200/yr × 10 = $2,000 | $200/yr × 10 = $2,000 |
| 10-year total cost of ownership | $27,900 | $29,200 |
That’s a $1,300 difference in favor of the gas furnace at the 10-year mark, close to even, despite the higher up-front heat pump cost.
But this is the picture BEFORE accounting for what the heat pump adds:
- Air conditioning included. Seattle summers are warmer than they used to be, and smoke season makes filtered indoor air essential. Adding AC to a furnace install costs another $5,000 to $7,500. The heat pump provides AC for free.
- No carbon monoxide risk. Gas furnaces require annual combustion analysis and CO detector monitoring. Heat pumps have none of that.
- No gas hookup needed. Future-proofs the home against potential gas-line rate increases or municipal gas bans.
Once you factor in the equivalent AC system, the math tilts decisively toward the heat pump for most Seattle homes: a heat pump install with AC functionality saves ~$5,000-$8,000 over 10 years versus furnace + AC.
When the gas furnace still wins
Three real scenarios:
Scenario A, Existing 96% high-efficiency furnace, under 8 years old
The furnace isn’t end-of-life. Replacing it now means wasting 8 to 12 years of remaining life. The math:
- Keep furnace + maintain: $200/yr × 8 years = $1,600 plus $1,600/yr operating = $14,400 over 8 years
- Replace now with heat pump: $16,200 net + $11,000 operating over 8 years = $27,200
Keep the furnace. Run it until ~year 18, then switch to a heat pump if the math still favors that direction at replacement time.
Scenario B, Major electrical work required
Some 1920s-1940s Seattle homes have 60A panels with active knob-and-tube wiring. To install a heat pump you’d need:
- Panel upgrade: $3,200
- K&T remediation: $5,000-$12,000 depending on scope
- Heat pump install: $19,400
Total: $27,600-$34,600 versus furnace install at $10,500.
The K&T issue isn’t really about the heat pump, most insurance carriers will eventually require it regardless. But if you can’t afford the rewire right now, a gas furnace replacement is the pragmatic call. Then plan the rewire + electrification when budget allows.
Scenario C, Homeowner preference
We’ve had a few customers say “I don’t want to depend on PSE electricity for heat after the 2024 storm outages.” That’s a real preference, even if the math says heat pump. Gas furnaces work during electrical outages with a battery backup for the blower (~$300-$500 add). We won’t try to talk you out of your preference.
What if I want AC but already have a working furnace?
Two paths:
Path A: Add a heat pump (replace furnace + AC together). The PSE rebate applies, the IRA credit applies. You’re paying $16,200 net for both heating and cooling, replacing furnace earlier than necessary. Worthwhile if your furnace is over 12 years old.
Path B: Add a ductless mini-split for cooling only, keep the furnace. A 2-zone mini-split runs $5,500-$8,000 installed. Furnace keeps doing heating. You get AC. PSE rebate doesn’t apply (mini-splits qualify but only if they’re the primary heating source).
For homes with newer furnaces (under 10 years), Path B is the right call. For homes with older furnaces (12+ years), Path A makes more sense, you’d be replacing the furnace soon anyway.
What about operating cost specifically?
This is the part where contractors and online articles often handwave. Real numbers:
Gas furnace operating cost (2,200 sq ft Seattle home, 2026 PSE rates):
- PSE natural gas: ~$1.20 per therm (October 2025 average)
- Annual usage: ~800 therms for heating
- Annual cost: ~$960 for heating
- Plus fixed connection / delivery: ~$200/yr
- Plus furnace fan electricity: ~$120/yr
- Total: ~$1,280-$1,600/yr depending on weather
Heat pump operating cost (same home):
- PSE electric: ~$0.11/kWh average
- Annual usage: ~8,500 kWh for heating + cooling
- Annual cost: ~$935 for heating + cooling
- Plus fixed delivery: ~$170/yr
- Total: ~$1,050-$1,200/yr
Net annual savings: ~$300-$500. Over 15 years (typical heat pump lifespan), that’s $4,500-$7,500 in operating cost savings. Plus you get AC.
Caveat: these numbers are based on a moderate-efficiency cold-climate heat pump (HSPF 9.5+) in a moderately-insulated Seattle home. Tighter envelopes save more; leakier homes save less. Older heat pumps (HSPF 7.5) save half as much.
Equipment lifespan
| Equipment | Typical Seattle lifespan |
|---|---|
| 96% AFUE gas furnace, properly maintained | 18-25 years |
| 80% AFUE gas furnace (older standard) | 15-22 years |
| Cold-climate heat pump, properly maintained | 15-20 years |
| Older non-cold-climate heat pump | 12-18 years |
Heat pumps run slightly shorter on average because they’re working year-round (heating winter, cooling summer). Furnaces only run half the year. But annual maintenance, which both need, extends both significantly.
PNW’s mild summers actually favor heat pumps. The biggest stressor on a heat pump compressor is thermal cycling between extreme outdoor temperatures, and Seattle’s relatively narrow temperature range (rarely above 95°F in summer, rarely below 18°F in winter) is gentle on the equipment.
What about backup heat?
Common worry: “What if the heat pump can’t keep up in January?”
For cold-climate heat pumps installed in Seattle since ~2020, this isn’t an issue. Modern units maintain rated capacity to 5°F and continue operating down to -15°F. Seattle’s coldest hour of any given winter is typically around 18°F.
For older heat pumps (pre-2018) installed in cold climates, you’d need an electric resistance backup heater. That’s not how modern systems work.
We only install cold-climate spec units in Seattle. They handle winter solo. No backup needed.
What about gas line rate increases or bans?
Seattle and Bellevue have both flagged potential gas-related municipal policy changes over the next 5-10 years. Likely outcomes:
- Gas connection fees may increase as fewer customers share infrastructure cost
- Some cities may ban new gas hookups in new construction (Seattle considering)
- Existing customers grandfathered in nearly all proposed policies
We don’t recommend the heat pump just because of policy uncertainty, the math works on its own. But if you’re on the fence, “no longer dependent on the gas grid” is a real benefit worth a few hundred dollars on the comparison.
Bottom line
For most Seattle homeowners replacing a gas furnace in 2026: the heat pump is the better call. PSE rebate + IRA credit + AC included + lower operating cost adds up to a meaningfully better 10-year outcome.
Three exceptions where furnace still wins:
- Existing furnace is under 8 years old
- Major electrical work (panel + K&T) would be required first and budget doesn’t support it
- You personally prefer gas for reasons unrelated to math
We don’t push you off gas. We do the calculation and put both numbers in front of you. The decision is yours.
Get both quotes from the same contractor
Most Seattle contractors do furnace OR heat pump installs and pitch the one they’re licensed/certified for. We do both. Every quote we provide includes a side-by-side of furnace and heat pump options for the same home, so you can compare apples to apples.
Call (206) 200-9134 or schedule online. Free consult, written quote within 24 to 48 hours, both options modeled.
Heat pump installation in Seattle · Furnace installation in Seattle