Longmont, CO Furnace Replacement Cost (2026): $4,350

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

$4,350 – $7,800

Most likely $6,100

Key takeaways for Longmont

Most Longmont homeowners land around $6,100 for furnace replacement, within a $4,350–$7,800 range that sits about 13% above the national average.
There's no real local labor premium or discount here — this price closely mirrors the national furnace replacement average.
A HVAC permit in Longmont runs about $225 — it's already folded into the estimate above.
Expect 15–30 years of service, so planning a replacement beats a full-price emergency call.
Cheapest time to buy: Spring and fall (Mar–May, Sep–Oct) — roughly 5–15% off peak-season pricing.
Check the rebates section below before you commit — 25C/25D federal credits and utility incentives can cut the net cost.

Price breakdown

What goes into the price in Longmont

A typical Longmont furnace replacement of $6,100 breaks down roughly like this — materials priced near the national level, labor set by local rates.

Line item	Longmont 2026 range
Materials & equipmentEquipment and supplies, which price out close to the national baseline.	$1,650 – $3,050
Labor & installationLabor to remove the old system and install the new one — this is where your city's wage index shows up.	$2,475 – $4,525
Permit & feesThe HVAC permit fee for this metro, based on local rates.	$225
Total installed cost	$4,350 – $7,800

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

Local factors

Why furnace replacement costs what it does in Longmont

Longmont's labor rates track the national average closely (based on price levels for the Boulder metro area).
Because Longmont sits in a cold climate zone, furnace replacement costs run about 8% higher than a neutral-climate baseline.
A HVAC permit in Longmont costs around $225, included above.

Furnaces here grind through long stretches of single-digit lows, so furnace replacement needs to be judged mainly on how well it heats. Prioritise a high-efficiency, properly-sized unit that can hold temperature through sustained sub-freezing spells, and confirm insulation and sealing first.

By size

Furnace Replacement cost by home size in Longmont

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	Longmont 2026 range
1,000 sq ft (≈45,000 BTU)	$3,250 – $5,850
1,500 sq ft (≈68,000 BTU)	$3,800 – $6,700
2,000 sq ft (≈90,000 BTU)	$4,350 – $7,800
2,500 sq ft (≈110,000 BTU)	$5,000 – $8,850
3,000 sq ft (≈130,000 BTU)	$5,650 – $9,950
3,500+ sq ft (≈150,000 BTU)	$6,250 – $11,050

National size ranges localized to Longmont labor and climate.

By type

Furnace Replacement cost by type in Longmont

Gas furnace	$4,200 – $7,700
High-efficiency gas furnace	$3,800 – $7,700
Electric furnace	$2,400 – $5,100

Adjusted to Longmont from national type-level ranges.

By efficiency

Furnace Replacement cost by efficiency in Longmont

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	$3,450 – $6,150
90–95% AFUE (high-efficiency)Best all-round value in most regions	$4,350 – $7,800
96%+ AFUE (condensing, premium)Lowest fuel bills; required in cold zones	$5,650 – $10,500

Where the money goes

Labor vs. materials in Longmont

Labor (60%)

≈ $3,650

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

Materials (40%)

≈ $2,450

Equipment & materials — priced closer to the national level.

Split based on a typical $6,100 Longmont project; your mix varies with scope.

Methodology

How we estimate it

National range	$3,800 – $7,000
Longmont labor adjustment	×1
cold climate factor	×1.08
Local permit	+$225
Longmont estimate	$4,350 – $7,800

Typical 2026

$6,100

Range

$4,350 – $7,800

Climate

cold

Local permit

$225

Promo prices vs. the real cost

Before you're swayed by an ad, know that HVAC pricing has two layers — the marketing number and the actual installed cost. Here's what the marketing layer usually covers:

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

Hidden costs

Additional furnace replacement costs to budget for

None of these are a given. What you actually pay hinges on the condition of the current system and how hard the site is to work in.

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

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

What affects the cost

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

Ways to save on furnace replacement in Longmont

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

Lifespan

How long does furnace replacement last in Longmont?

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 Longmont

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 Longmont?

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 Colorado

HEAR closing

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 out a heat pump often qualifies you for far larger rebates.

Colorado Home Energy Rebates (HEAR) ↗Colorado Energy Office
Up to $8,000 toward a heat pump for income-qualifying households, by region.
Xcel Energy Rebates ↗Xcel Energy
Around $2,000 for a cold-climate heat pump, plus insulation bonuses.

Status: Colorado's HEAR Region 1 (Front Range) closed April 28, 2026; Region 2 accepts applications until about August 1, 2026 or until funds are reserved. Xcel Energy rebates continue.

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 Longmont

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%

Replace before it fails — schedule AC work in fall/winter and heating work in spring/summer, so you can shop quotes without pressure.

Reading your quotes

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

Two contractors can price the same job thousands apart. Almost always it's the scope each assumed — here's what drives the gap and how to close it.

Why a quote looks high (or low)

One quote bundles ductwork, electrical, permit and old-unit removal; another quietly leaves them out.
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.

Get an apples-to-apples bid

Confirm old-unit removal, the permit and startup testing are all included.
Insist on a Manual J load calculation, not a square-footage guess.
Ask every bidder for the same SEER2/AFUE rating so you compare like for like.
Get at least three written bids before you sign.

Hiring

Questions to ask Longmont HVAC pros

Quotes only compare cleanly when every bidder is pricing the same work — put these to each of them before you commit.

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 Longmont

How much does furnace replacement cost in Longmont, CO?

furnace replacement in Longmont runs $4,350–$7,800 as of 2026, with $6,100 the figure most homeowners actually land on. That range already accounts for Longmont's labor rates, its cold climate and local permit costs.

Is furnace replacement more expensive in Longmont than average?

Yes — Longmont is about 13% higher than the national average, largely a function of local labor pricing at 1× the US average. (a local HVAC permit tacks on about $225).

Do I need a permit for furnace replacement in Longmont?

Expect to pull a HVAC permit in Longmont — about $225 — which is already built into the estimate above, not an extra charge.

What affects furnace replacement cost the most?

Replacing a residential furnace, including the unit and installation labor. Where two homes diverge is in the details below. Price swings mostly come down to equipment or material grade, the size and complexity of the home, local labor, and the 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 budget-first case

In a temperate region the smart move is to size the job correctly with a Manual J and take the base efficiency tier. A system that spends most days coasting can't recover the cost of a high-SEER2 compressor, because the savings only show up under heavy load you don't put on it. Match the equipment to how little you actually run it, not to the brochure's top number.

The efficiency-first case

High runtime changes the math. In a demanding climate the extra efficiency of a heat pump or a top-tier SEER2/AFUE unit gets paid back month after month on the utility bill, and state and utility incentives can shave the upfront figure further now that the federal 25C/25D credits have expired. Price the lifetime bills, not just the tag, before you default down.

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.

Our take

Skip the brand debate. A correctly sized system, an efficiency tier that fits your climate, and a properly commissioned install will save you more than any label ever could.

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 Longmont using the BEA Regional Price Parity labor index (×1 here), the IECC cold-climate factor (×1.08) and a typical local permit fee (≈$225). 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 Longmont 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.