Average Furnace Replacement Cost in New Hampshire (2026)
Furnace replacement including equipment and professional installation.
Average in NH
$5,175
Typical Range
$2,875 – $8,625
vs National Average
+15%
New Hampshire vs National Average
2026 Furnace Cost by Home Size in New Hampshire
| Home size | Typical sqft / capacity | Low | High |
|---|---|---|---|
| Small home | 1,000–1,500 sqft | $2,156 | $7,331 |
| Average home | 1,500–2,500 sqft | $2,875 | $8,625 |
| Large home | 2,500–3,500 sqft | $3,737 | $12,075 |
| Estate / multi-zone | 3,500+ sqft | $4,600 | $16,388 |
Ranges reflect 2026 New Hampshire pricing including labor, materials, permits, and standard removal/disposal. Metro-level pricing within the state may run ±15% from these ranges.
What Impacts Your Furnace Replacement Cost
AFUE efficiency rating
+25–50%An 80% AFUE furnace is the budget baseline; 95–98% AFUE condensing units cost more but cut fuel bills 15–20% and qualify for tax credits.
Fuel type
VariableNatural gas is cheapest to operate; propane and oil furnaces cost more upfront for storage and delivery infrastructure.
BTU sizing
+15–30%Each 20,000 BTU step up adds equipment cost. Oversizing causes short-cycling and reduces lifespan.
Venting changes
+$400–$1,200Switching to a 95%+ condensing furnace requires PVC sidewall venting and a condensate drain — not always trivial in older homes.
Ductwork modifications
+$1,000–$4,000If your old ductwork was undersized for the new furnace, expect rebalancing or trunk line modifications.
Real New Hampshire Quote Examples
60,000 BTU 80% AFUE single-stage furnace
Like-for-like replacement, no venting changes, 4-hour install
Total
$4,399
80,000 BTU 95% AFUE two-stage condensing furnace
Includes new PVC venting and condensate pump
Total
$5,951
100,000 BTU 96% AFUE modulating with smart thermostat
Federal tax credit eligible; replaces 25-year-old unit with major venting upgrade
Total
$8,021
Composite examples derived from HomeScore's 2026 New Hampshire contractor quote dataset. Scenarios are representative; individual quotes vary with site conditions.
Should You Repair or Replace Your Furnace?
Replace if past
15 yrs
…AND repair quote exceeds
50%
of full replacement
In New Hampshire, that's roughly
$2,588
If your furnace is past 15 years and any repair quote exceeds 50% of replacement, replace. Cracked heat exchangers are non-repairable and a carbon monoxide hazard.
See the full Repair vs Replace framework for furnace →Project Timeline: What to Expect
| Phase | Typical duration |
|---|---|
| Load calc + quotes | 1–2 weeks |
| Equipment order | 1–2 weeks |
| Install | 1 day for like-for-like; 2 days with venting/ductwork changes |
| Inspection | Within 1 week |
How to Save on Furnace Replacement
Federal 25C tax credit
Saves Up to $60095% AFUE+ furnaces qualify through 2032. Save the AHRI certificate.
Utility rebates
Saves $200–$800Gas utilities frequently offer instant rebates on high-efficiency furnaces.
Off-season install
Saves 8–12%Quote in April–August in heating-dominant climates; many installers offer pre-season specials.
Right-size with Manual J
Saves $400–$1,200A proper load calculation often reveals you need a smaller furnace than your old one — equipment savings plus lower operating costs.
Frequently Asked Questions
Is this actually worth it?
A furnace replacement in 2026 typically returns 60–80% of project cost at resale within the first 5 years, and avoids 2–4× higher emergency-replacement pricing. Owners with a documented furnace timeline negotiate ~$3,800 better at sale on average.
Run the ROI mathShould you replace now or wait?
Break-even rule: if annual repair cost exceeds 8% of replacement cost — or the unit is past 75% of expected life — replacement wins. Below that threshold, deferring 18–36 months and funding a sinking fund usually beats panic timing by $1,800–$5,400.
Run the break-even mathHow this impacts your home value
A failing or end-of-life furnace typically triggers a $4,000–$12,000 appraiser adjustment in New Hampshire and shows up in inspection reports as a buyer-negotiation lever. A documented replacement plan inside the last 3 years of life preserves listing price.
Build the resale-ready planFurnace Costs in Nearby States
| State | Average Cost | vs National |
|---|---|---|
| New Hampshire (this state) | $5,175 | +15% |
| Vermont | $5,040 | +12% |
| Rhode Island | $5,310 | +18% |
| Maine | $4,950 | +10% |
| Maryland | $4,950 | +10% |
| Washington | $4,950 | +10% |
Furnace in Nearby States
Other System Costs in New Hampshire
HVAC System
Avg: $8,625
Roof
Avg: $10,350
Water Heater
Avg: $2,070
Electrical Panel
Avg: $2,875
Plumbing System
Avg: $4,600
Windows
Avg: $9,775
Siding
Avg: $13,800
Foundation
Avg: $17,250
Insulation
Avg: $5,750
Garage Door
Avg: $3,220
Deck
Avg: $13,800
Furnace Brand Lifespan Guides
See how long top furnace brands last before needing replacement.
Carrier
15–25 year lifespan
Trane
15–25 year lifespan
Lennox
15–22 year lifespan
Rheem
12–20 year lifespan
Goodman
10–18 year lifespan
York
12–20 year lifespan
American Standard
15–22 year lifespan
Daikin
15–22 year lifespan
Bryant
12–20 year lifespan
Heil
10–18 year lifespan