A furnace that quits in January doesn’t leave much room for research. You’re cold, you’re getting quotes, and the numbers are all over the place — one contractor says $4,200, the next says $9,800, and neither one explains why.
Here’s what furnace replacement actually costs in Vancouver and Clark County in 2026, what separates a $4,000 job from a $10,000 one, and which rebates are still on the table for Washington homeowners.
The Short Answer
Most Vancouver-area homeowners spend $5,500 to $8,500 to replace a gas furnace in 2026, fully installed. The full range runs from about $4,000 for a basic 80% AFUE unit in a straightforward swap, up to $12,000 for a high-efficiency modulating system that needs new venting and duct work.
Here’s how that breaks down by equipment type:
| System type | Installed cost | Best for |
| 80% AFUE, single-stage gas | $4,000 – $6,500 | Budget replacement, existing metal flue |
| 92–95% AFUE, single or two-stage | $5,500 – $8,500 | Most Clark County homes |
| 96%+ AFUE, two-stage or modulating | $7,500 – $12,000 | Larger homes, comfort-focused, long-term owners |
| Electric furnace | $3,000 – $6,000 | Homes with no gas service |
Those numbers include the unit, labor, permit, and haul-away of the old system. They do not include duct replacement or a gas line run — more on those below.
What Actually Drives the Price
1. Efficiency rating (AFUE)
AFUE stands for Annual Fuel Utilization Efficiency — the percentage of the gas you buy that turns into usable heat. An 80% AFUE furnace sends 20 cents of every gas dollar up the flue. A 96% furnace sends about 4 cents.
The catch is that anything above roughly 90% AFUE is a condensing furnace, which vents through PVC pipe out a sidewall instead of up your existing chimney or metal flue. That’s a different installation, and it adds cost:
- New PVC intake and exhaust venting: $500 – $1,500
- Condensate drain line and, sometimes, a condensate pump: $150 – $500
- Abandoning or re-lining the old flue if a gas water heater still shares it: $400 – $1,200
That last one surprises people. If your furnace and water heater currently share a chimney, pulling the furnace off it can leave the water heater venting into a flue that’s now oversized for it — which is a combustion safety issue, not an optional upgrade.
2. Sizing and home size
Furnaces are sized in BTUs. A 1,400 sq ft ranch in Hazel Dell might need 60,000 BTUs; a 3,000 sq ft two-story in Felida might need 100,000. Bigger units cost more, but the bigger issue is that oversizing is the most common installation mistake in this industry.
An oversized furnace short-cycles: it blasts to temperature, shuts off, and repeats. You get hot-and-cold swings, more wear on the ignitor and blower, and worse humidity control. A proper quote is based on a Manual J load calculation — square footage, insulation, window area, orientation, air sealing — not a rule of thumb.
If a contractor sizes your system by looking at the label on the old furnace, they’re assuming the last installer got it right.
3. Ductwork condition
This is the single biggest swing factor in Vancouver’s older housing stock. Homes built before the mid-1980s frequently have ducts with disconnected joints, crushed flex runs in the crawlspace, or no sealing at all.
- Minor duct repair and sealing: $600 – $2,000
- Partial duct replacement: $1,500 – $4,000
- Full duct replacement: $4,000 – $8,000+
Leaky ducts can bleed 20–30% of your conditioned air into the crawlspace. Putting a 96% AFUE furnace on a leaky duct system is like buying a hybrid car and driving it with the parking brake on.
4. Everything else
- Gas line run or resize: $350 – $2,000 (only if converting or upsizing)
- Electrical work: $200 – $600 if the circuit or disconnect needs updating
- Clark County permit and inspection: typically $150 – $400
- Smart thermostat: $180 – $450 installed
- Media filter cabinet (4–5″ filter): $320 – $650
- Difficult access: attic and tight-crawlspace installs add labor hours
Rebates for Vancouver Homeowners in 2026
This is where a lot of Clark County homeowners leave money behind, because the rebate picture here is genuinely confusing. Two different organizations serve Vancouver, and they cover different things.
Clark Public Utilities: electric heat only
Clark Public Utilities rebates are for customers with electrically heated homes. If you’re replacing a gas furnace with another gas furnace, CPU has nothing for you — their programs are built around getting people off electric resistance heat.
What CPU does offer, if you currently heat with an electric furnace or zonal heat (baseboards, wall heaters, cable ceiling heat):
- $1,000 for converting an electric forced-air furnace to a central heat pump (7.5+ HSPF2)
- $1,250 for converting an electric forced-air furnace to a central variable speed heat pump
- $900 for a ductless heat pump in a home with electric furnace or zonal heat
- $140 smart thermostat rebate for homes with an electric furnace or heat pump
All CPU rebates require installation by a contractor in their Contractor Network, and self-installs don’t qualify.
Energy Trust of Oregon: yes, it covers Vancouver
Most Vancouver homeowners assume Energy Trust is Oregon-only. It isn’t. Energy Trust administers incentives for NW Natural customers in Southwest Washington — and since NW Natural is the gas utility for most of Clark County, that likely means you.
For a gas furnace replacement:
- $800 Energy Trust incentive for a 95%+ AFUE gas furnace as the home’s primary heat source
- Up to $1,600 for income-qualified households through Savings Within Reach
- $200 additional NW Natural incentive when the furnace is installed by a NW Natural Preferred Contractor
A few requirements worth knowing before you sign anything: the furnace must be 95% AFUE or higher, it has to be the home’s primary heat source, and gas furnaces installed as backup for a heat pump (hybrid systems) are not eligible for this particular incentive. A CO monitor is required on every floor with a bedroom.
Because the $800 is applied as an instant credit through your contractor rather than a check you chase later, it comes straight off your invoice.
The federal credit is gone
The federal 25C energy efficiency tax credit — the one that gave you up to $600 back on a qualifying furnace — expired December 31, 2025. Any contractor still advertising it in 2026 is working from an old script. We covered what replaced it in our guide to what Portland and Vancouver homeowners can still save in 2026.
Repair or Replace?
A reasonable rule: multiply the repair cost by the furnace’s age. If that number is over about $5,000, replacement usually makes more sense.
A $400 repair on an 8-year-old furnace is $3,200 — fix it. A $700 repair on a 17-year-old furnace is $11,900 — you’re putting money into a system that’s near the end anyway.
Beyond the math, replace rather than repair when:
- The furnace is 15+ years old and needs a significant repair (heat exchanger, control board, inducer motor)
- The heat exchanger is cracked — this is a carbon monoxide risk and is never worth repairing
- You’ve called for service twice or more in the last two heating seasons
- Some rooms never get warm, and it’s not a duct or airflow issue
- Your gas bill is climbing while your usage habits haven’t changed
Gas furnaces generally last 15 to 20 years in our climate. Because Pacific Northwest winters are mild, ours often run at the longer end of that — which also means a lot of Clark County homes are running furnaces installed in the mid-2000s that are due.
Should You Get a Heat Pump Instead?
Worth asking, because the rebate math changes the answer for a lot of homes.
A gas furnace does one job: heat. A heat pump heats and cools, which matters more every summer we get a stretch of upper-90s days. And if you currently heat with electric resistance heat, the Clark PUD rebates above knock $900–$1,250 off a heat pump — money that simply doesn’t exist for a gas furnace.
Where a gas furnace still wins: you already have gas service, gas is cheap relative to electricity in Clark County, and the upfront cost is lower than a comparable heat pump. Many homeowners here land on a dual-fuel system — a heat pump for most of the year with a gas furnace taking over on the coldest mornings.
If you’re weighing the two, our 2026 heat pump pricing guide lays out those numbers side by side. Just note the rebate wrinkle: a gas furnace installed as heat pump backup isn’t eligible for the $800 Energy Trust furnace incentive, so the dual-fuel path is worth pricing carefully.
How to Read a Furnace Quote
A quote you can actually compare should tell you:
- The exact model number and BTU capacity, not “a 90% furnace”
- The AFUE rating and stage type (single, two-stage, modulating)
- Whether a load calculation was performed
- What venting work is included
- Whether the permit is pulled by the contractor
- Old equipment removal and disposal
- Labor warranty separate from the manufacturer’s parts warranty
- Which rebates are applied, and whether they come off the invoice or arrive later
Red flags: a quote written on a single line with one number, pressure to sign the same day, a “today only” discount, or a bid that skips the load calculation entirely. Get at least two quotes on a planned replacement — and if you’re mid-emergency in January, it’s fair to ask about a temporary heat solution so you’re not deciding under pressure.
Frequently Asked Questions
How much does it cost to replace a furnace in Vancouver, WA?
Most Vancouver homeowners spend $5,500 to $8,500 in 2026 for a fully installed gas furnace replacement. Basic 80% AFUE swaps start around $4,000, while high-efficiency modulating systems with venting and duct work can reach $12,000.
Does Clark Public Utilities offer a rebate for a gas furnace?
No. Clark Public Utilities rebates apply to electrically heated homes — heat pumps, ductless systems, heat pump water heaters, and weatherization. For gas furnace incentives in Vancouver, the program to look at is Energy Trust of Oregon, which serves NW Natural customers in Southwest Washington.
Can Vancouver, WA residents really get Energy Trust rebates?
Yes, if NW Natural is your gas utility. Energy Trust administers incentives for NW Natural customers in Southwest Washington, including an $800 incentive for a 95%+ AFUE gas furnace installed as the home’s primary heat source.
Is a 96% AFUE furnace worth the extra cost here?
It depends on how long you’ll stay in the home. The efficiency jump from 80% to 96% typically saves $150–$300 per year in our mild climate, against $1,500–$3,000 in additional upfront cost — so payback often runs 8 to 15 years. If you’re staying long-term, it pencils out. If you’re selling in three years, an efficient 92–95% unit is usually the better value.
How long does a furnace replacement take?
A straightforward like-for-like swap is typically a single day, 4 to 8 hours. Add a day if the job involves new venting, converting from a chimney-vented to a sidewall-vented system, or duct modifications.
Do I need a permit to replace a furnace in Clark County?
Yes. Furnace replacement requires a mechanical permit and inspection. A licensed contractor should pull it as part of the job — if a bid doesn’t mention a permit, ask why. Unpermitted work can create problems at resale and can void equipment warranties.
What size furnace do I need?
It depends on a load calculation, not square footage alone. As a rough reference, Clark County homes commonly land between 60,000 and 100,000 BTUs, but insulation, window area, ceiling height, and air sealing all shift that. Insist on a Manual J calculation rather than matching the old unit’s label.
Get a Real Number for Your Home
Every one of the ranges above moves based on your ductwork, your venting situation, and which rebates you qualify for. The only way to know your number is to have someone look at the actual system.
We offer free in-home estimates, run a proper load calculation, and apply qualifying Energy Trust and Clark Public Utilities rebates directly to your invoice — so the price you see is the price you pay.
- Vancouver, WA: (360) 773-1520
- Portland, OR: (503) 784-1270
Schedule online, or read more about your options:
- Furnace installation and replacement
- Heat pump installation
- Ductless mini-split systems
- Current discounts & incentives
- Financing options
Last updated: August 2026. Pricing reflects typical Clark County installations and will vary by home. Rebate programs and amounts are subject to change without notice — confirm current eligibility before signing a contract.