Dover, NH Furnace Replacement Cost (2026): $4,550

Refine your estimate

Tune it to your home to narrow the furnace replacement range.

Home size2,000 sq ft

800 sq ft4,500 sq ft

Quality tier

Conditions & add-ons

Your adjusted estimate

$4,550 – $8,150

Most likely $6,350

Key takeaways for Dover

Expect $4,550 to $8,150 for furnace replacement in Dover; most quotes cluster near $6,350, about 18% above the national average.
The +8% gap between Dover and national labor rates is the single biggest reason this price isn't the national average.
Set aside roughly $250 for the permit; that's already part of the range above, not an add-on.
A well-installed job here typically lasts 15–30 years — plan the next replacement instead of waiting for an emergency one.
Time it right and you can save 5–15%: the best window to book is Spring and fall (Mar–May, Sep–Oct).
The estimate above is before incentives; federal 25C/25D credits and utility rebates below can reduce what you actually pay.

Price breakdown

What goes into the price in Dover

A typical Dover furnace replacement of $6,350 breaks down roughly like this — materials priced near the national level, labor set by local rates.

Line item	Dover 2026 range
Materials & equipmentUnit, materials and supplies — priced close to the national level.	$1,700 – $3,150
Labor & installationInstall crew, removal and startup — the part local rates move most.	$2,600 – $4,750
Permit & feesThe HVAC permit fee for this metro, based on local rates.	$250
Total installed cost	$4,550 – $8,150

Split from the Dover estimate using a 60% local-labor share; line items sum to the total.

Local factors

Why furnace replacement costs what it does in Dover

Labor in Dover runs about 8% above the national average (based on price levels for the Manchester-Nashua metro area), which raises the installed price.
Because Dover sits in a cold climate zone, furnace replacement costs run about 8% higher than a neutral-climate baseline.
Dover's HVAC permit runs roughly $250, which is already part of the number above.

Winters here are genuinely cold, so furnace replacement needs to be judged mainly on how well it heats. Look for a properly-sized, high-efficiency system that won't struggle in extended sub-freezing weather — and check your insulation before you buy.

By size

Furnace Replacement cost by home size in Dover

Furnace cost scales with the heating capacity (BTU) your home needs — roughly 40–45 BTU per square foot in a mixed climate. Larger homes need a bigger unit and more ductwork.

home size	Dover 2026 range
1,000 sq ft (≈45,000 BTU)	$3,400 – $6,150
1,500 sq ft (≈68,000 BTU)	$4,000 – $7,050
2,000 sq ft (≈90,000 BTU)	$4,550 – $8,150
2,500 sq ft (≈110,000 BTU)	$5,250 – $9,300
3,000 sq ft (≈130,000 BTU)	$5,900 – $10,450
3,500+ sq ft (≈150,000 BTU)	$6,600 – $11,550

National size ranges localized to Dover labor and climate.

By type

Furnace Replacement cost by type in Dover

Gas furnace	$4,450 – $8,050
High-efficiency gas furnace	$4,000 – $8,050
Electric furnace	$2,500 – $5,350

Adjusted to Dover from national type-level ranges.

By efficiency

Furnace Replacement cost by efficiency in Dover

Efficiency is measured in AFUE — the percentage of fuel turned into heat. Higher AFUE costs more upfront but cuts fuel bills, and in cold (northern) regions the DOE requires ≥95% AFUE gas furnaces.

80% AFUE (standard)Lowest upfront; fine in mild climates	$3,650 – $6,500
90–95% AFUE (high-efficiency)Best all-round value in most regions	$4,550 – $8,150
96%+ AFUE (condensing, premium)Lowest fuel bills; required in cold zones	$5,900 – $11,000

Where the money goes

Labor vs. materials in Dover

Labor (60%)

≈ $3,800

Install crew, removal, permit & startup — the part Dover rates move most.

Materials (40%)

≈ $2,550

Equipment & materials — priced closer to the national level.

Split based on a typical $6,350 Dover project; your mix varies with scope.

Methodology

How we estimate it

National range	$3,800 – $7,000
Dover labor adjustment	×1.05
cold climate factor	×1.08
Local permit	+$250
Dover estimate	$4,550 – $8,150

Typical 2026

$6,350

Range

$4,550 – $8,150

Climate

cold

Local permit

$250

Promo prices vs. the real cost

A cheap headline number is usually a hook to get a technician in the door, not the price of the job. Compare it against the real installed estimate above:

"Free" replacement estimate$0 — it's a sales visit
Seasonal tune-up promo$79–$129
Service call / diagnostic fee$75–$150
Financing offers$0 down · 0% APR, 12–60 mo

Hidden costs

Additional furnace replacement costs to budget for

These aren't always in the headline price. Whether you'll pay them depends on your home's condition and setup.

Old furnace removal & disposal	$50 – $330
New ductwork (vs. repair $300–$1,500)Only if ducts are missing or failing	$1,000 – $5,000
Gas line run or upgrade	$250 – $800
Chimney liner (for high-efficiency venting)	$600 – $2,500
Smart thermostat	$150 – $500

Typical national add-on ranges; confirm locally during your quote.

What's included

Thermostat connection and system startup/testing
Removal and disposal of the old unit
The furnace unit and burner assembly
Installation labor and basic ductwork connections

What affects the cost

Fuel type (gas vs electric) and AFUE efficiency rating
Heating capacity (BTU) needed for your square footage
Condition of existing ductwork and venting
Whether a chimney liner or new gas line is required

Ways to save on furnace replacement in Dover

Schedule in the off-season (spring/summer) for better rates
Look for utility rebates on high-efficiency models
Right-size the unit; oversizing wastes money and cycles hard
Get at least 3 quotes — installed prices vary widely

Lifespan

How long does furnace replacement last in Dover?

Expected lifespan

15–30 years

Gas furnaces typically last 15–20 years; well-maintained units can reach 30.

Annual maintenance

$70–$300/yr

An annual tune-up keeps efficiency up and protects the warranty.

When to replace

Signs you need furnace replacement in Dover

The furnace is 15+ years old (near or past its service life)
Heating bills keep climbing despite no change in usage
Some rooms are warm while others stay cold (uneven heating)
Frequent repairs — you've called for service more than once or twice recently
Banging, rattling or screeching noises on startup
A yellow or flickering burner flame instead of steady blue (have it checked immediately)
More dust, dryness, or a stale smell when the heat runs

Decision

Repair or replace in Dover?

The $5,000 rule: multiply the repair quote by the furnace's age in years. If it tops $5,000, replacement is usually the smarter spend.

Repair if…

The unit is under ~10 years old and otherwise efficient
The fix is a single inexpensive part (igniter, flame sensor, capacitor)
It's still under manufacturer warranty

Replace if…

It's 15+ years old and needs a major part
The heat exchanger is cracked (a safety issue — replace, don't repair)
The repair costs more than about half of a new system
It's an 80% AFUE unit and your fuel bills are high in a cold climate

Rebates & incentives in New Hampshire

Most 2026 rebates reward switching to a heat pump, not a like-for-like gas furnace. Replacing a gas furnace, your savings are mainly utility efficiency rebates (high-AFUE models) — but pricing a heat pump can unlock far larger rebates.

The federal 25C tax credit (up to $2,000 for heat pumps; $600 for high-efficiency AC or furnaces) and the 25D credit ended December 31, 2025 under the One Big Beautiful Bill Act — neither is available for 2026 installs. The remaining federal help is the IRA Home Electrification & Appliance Rebates (HEAR): up to $8,000 toward a heat pump for households under 150% of area median income, paid at point of sale where a state has launched its program.

Verified July 2026. Rebate budgets deplete and program windows change fast — confirm current amounts and eligibility with your utility and the DSIRE database before you budget. Costadia does not administer these programs.

Best time to buy

Cheapest time for furnace replacement in Dover

Installers cut prices in spring and fall because job volume drops and crews sit idle — the opposite happens during a summer heat wave or winter cold snap, when a dead system forces homeowners into a full-price emergency swap.

Best window

Spring and fall (Mar–May, Sep–Oct)

Avoid

Peak summer and mid-winter

Off-peak savings

5–15%

Don't wait for a breakdown — book AC replacement in the cooler months and furnace work in the warmer ones, so you're comparing quotes instead of taking whoever answers the phone.

Reading your quotes

Why furnace replacement quotes vary — and how to compare them fairly

Two bids for the “same” job can differ by thousands. Usually it's scope, not greed — here's what moves the number and how to get an apples-to-apples comparison.

Why a quote looks high (or low)

Equipment tier isn't matched — a 14.3 SEER2 bid will always undercut an 18 SEER2 one for the "same" job.
Brand, warranty length and whether startup/commissioning is included all move the number.
One quote bundles ductwork, electrical, permit and old-unit removal; another quietly leaves them out.

Get an apples-to-apples bid

Get at least three written bids before you sign.
Insist on a Manual J load calculation, not a square-footage guess.
Confirm old-unit removal, the permit and startup testing are all included.
Require an itemized quote splitting equipment, labor, permit and add-ons.

Hiring

Questions to ask Dover HVAC pros

Comparing quotes is only fair when they cover the same scope. Ask every bidder these before you sign.

1Did you run a Manual J load calculation to size the system, or estimate from square footage?
2What AFUE/SEER2 rating is this unit, and what's the payback vs. the next tier up?
3Is removal of the old equipment, the permit, and startup testing included in the quote?
4Will my existing ductwork and venting work as-is, or is repair/resizing needed?
5What's covered under the labor warranty vs. the manufacturer's parts warranty?

FAQ

Furnace Replacement in Dover

How much does furnace replacement cost in Dover, NH?

For Dover homeowners, furnace replacement typically falls between $4,550 and $8,150 in 2026, averaging close to $6,350. Local labor, the cold climate and permit fees are all baked into that number.

Is furnace replacement more expensive in Dover than average?

Yes — Dover is about 18% higher than the national average, largely a function of local labor pricing at 1.05× the US average., plus a local HVAC permit running about $250.

Do I need a permit for furnace replacement in Dover?

In Dover, this usually needs a HVAC permit (around $250). The estimate above already accounts for it.

What affects furnace replacement cost the most?

Replacing a residential furnace, including the unit and installation labor. Four things drive the number more than anything else — equipment/material grade, home size and complexity, local labor, and your cold climate zone.

Editors' roundtable

How much should you really budget for HVAC in 2026?

Ask five contractors for an HVAC quote and you'll get five different numbers — usually because they disagree on sizing, efficiency and equipment tier. Here's how our editors think through those trade-offs.

The longevity case

The single biggest cost driver isn't the brand — it's correct sizing and install quality. A properly sized, well-commissioned mid-tier system with annual maintenance outlasts an oversized premium unit that short-cycles. Spend on the install, not the badge.

The budget-first case

Size the system to your home with a Manual J calculation and buy the standard efficiency tier (80% AFUE / 14.3 SEER2). In a mild climate the cheaper unit pays off because you rarely run it hard — paying for premium efficiency you won't use is the most common way to overspend.

The efficiency-first case

In a hot-summer or cold-winter region, a higher SEER2/AFUE unit — or a heat pump — earns its premium back in lower bills, and utility and state rebates can still cut into the sticker (the federal 25C/25D credits ended Dec 2025). Run the payback math before defaulting to the cheapest box.

Our take

The brand on the unit matters far less than getting the sizing and installation right. Insist on a Manual J calculation, match efficiency to your climate, and claim every rebate available.

Editorial analysis by Serhat Özçelik, reviewed by Costadia Editorial. These are our own cost perspectives, not third-party endorsements.

How we calculated this estimate

We start with 2026 national furnace replacement ranges compiled from contractor-pricing sources (Angi, HomeGuide, Fixr and EnergySage averages), then localize them to Dover using the BEA Regional Price Parity labor index (×1.05 here), the IECC cold-climate factor (×1.08) and a typical local permit fee (≈$250). Federal incentive details reference the IRS Inflation Reduction Act (25C/25D) and DSIRE.

This is a planning estimate, not a quote.Actual prices vary with your home's condition, equipment grade and contractor — always confirm with licensed local pros before budgeting.

By Serhat ÖzçelikReviewed by Costadia EditorialUpdated June 2026Sources: BLS · BEA · IECC · IRS · DSIRE · industry cost data

References & data sources

Our Dover furnace replacement estimate is built from these primary, mostly government sources — not a single aggregator.

Occupational Employment & Wage Statistics (metro wages) — U.S. Bureau of Labor Statistics.Metro-level trade wages behind each city's labor index.
Regional Price Parities (state & metro) — U.S. Bureau of Economic Analysis.Regional price levels used where metro wage data is unavailable.
IECC Climate Zones — U.S. DOE — Building Energy Codes Program.Climate-zone factors applied to weather-sensitive projects.
Home Energy Tax Credits (25C / 25D) — Internal Revenue Service.Federal rebate and tax-credit figures for eligible upgrades.
Database of State Incentives for Renewables & Efficiency — DSIRE — NC State University.State and utility incentive programs by ZIP code.