Mount Prospect, IL Furnace Replacement Cost (2026): $4,900

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

$4,900 – $8,800

Most likely $6,850

Key takeaways for Mount Prospect

Expect $4,900 to $8,800 for furnace replacement in Mount Prospect; most quotes cluster near $6,850, about 27% above the national average.
Labor is the swing factor here: Mount Prospect trades bill +6% relative to the national average.
Budget about $225 for the local HVAC permit; it's already included above.
Service life runs 15–30 years on average; replacing on your schedule beats replacing on an emergency one.
Roughly 5–15% comes off when you book in Spring and fall (Mar–May, Sep–Oct) instead of peak season.
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 Mount Prospect

A typical Mount Prospect furnace replacement of $6,850 breaks down roughly like this — materials priced near the national level, labor set by local rates.

Line item	Mount Prospect 2026 range
Materials & equipmentEquipment and supplies, which price out close to the national baseline.	$1,850 – $3,450
Labor & installationThe installation work itself — removal, setup and startup — is what your city's labor rate actually moves.	$2,825 – $5,125
Permit & feesLocal building-department fee for HVAC work here.	$225
Total installed cost	$4,900 – $8,800

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

Local factors

Why furnace replacement costs what it does in Mount Prospect

Labor in Mount Prospect runs about 6% above the national average (based on price levels for the Chicago-Naperville-Elgin metro area), which raises the installed price.
The cold climate in Mount Prospect adds roughly 8% to typical furnace replacement pricing versus a neutral climate.
Budget about $225 for the local HVAC permit in Mount Prospect — already folded into the estimate above.

Heating degree days here pile up past 6,000 in a typical year, meaning furnace replacement's cold-weather performance matters more than anything else. 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 Mount Prospect

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	Mount Prospect 2026 range
1,000 sq ft (≈45,000 BTU)	$3,650 – $6,600
1,500 sq ft (≈68,000 BTU)	$4,250 – $7,600
2,000 sq ft (≈90,000 BTU)	$4,900 – $8,800
2,500 sq ft (≈110,000 BTU)	$5,600 – $10,050
3,000 sq ft (≈130,000 BTU)	$6,350 – $11,250
3,500+ sq ft (≈150,000 BTU)	$7,100 – $12,500

National size ranges localized to Mount Prospect labor and climate.

By type

Furnace Replacement cost by type in Mount Prospect

Gas furnace	$4,800 – $8,700
High-efficiency gas furnace	$4,300 – $8,700
Electric furnace	$2,700 – $5,750

Adjusted to Mount Prospect from national type-level ranges.

By efficiency

Furnace Replacement cost by efficiency in Mount Prospect

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	$3,900 – $6,950
90–95% AFUE (high-efficiency)Best all-round value in most regions	$4,900 – $8,800
96%+ AFUE (condensing, premium)Lowest fuel bills; required in cold zones	$6,350 – $11,850

Where the money goes

Labor vs. materials in Mount Prospect

Labor (60%)

≈ $4,100

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

Materials (40%)

≈ $2,750

Equipment & materials — priced closer to the national level.

Split based on a typical $6,850 Mount Prospect project; your mix varies with scope.

Skilled installers in the Chicago-Naperville-Elgin area earn about $38.1/hr (23% above the US average, per BLS metro wage data) — the local wage is what moves the labor half of your furnace replacement cost.

Methodology

How we estimate it

National range	$3,800 – $7,000
Mount Prospect labor adjustment	×1.14
cold climate factor	×1.08
Local permit	+$225
Mount Prospect estimate	$4,900 – $8,800

Typical 2026

$6,850

Range

$4,900 – $8,800

Climate

cold

Local permit

$225

Promo prices vs. the real cost

Ads for HVAC work often lead with a number that has little to do with a finished install. The figures below are what that number actually buys:

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

Hidden costs

Additional furnace replacement costs to budget for

Expect a few of these rather than all. Which ones apply tracks with access, hidden damage and local code.

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

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

What affects the cost

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

Ways to save on furnace replacement in Mount Prospect

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

Lifespan

How long does furnace replacement last in Mount Prospect?

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 Mount Prospect

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 Mount Prospect?

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 Illinois

HEAR pending

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.

Illinois Home Energy Rebates (HEAR) ↗Illinois EPA
Not yet live; utility rebates (ComEd, Nicor Gas) are the current path.

Status: Illinois has federal HEAR funding but had not launched its consumer program as of mid-2026 — check ComEd/Nicor utility rebates in the meantime.

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 Mount Prospect

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

A wide spread between bids rarely means someone is overcharging; it usually means they priced different work. Below is what moves the number and how to line the quotes up.

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.
Sizing was guessed from square footage instead of a Manual J load calculation, so the equipment is wrong.

Get an apples-to-apples bid

Ask every bidder for the same SEER2/AFUE rating so you compare like for like.
Confirm old-unit removal, the permit and startup testing are all included.
Require an itemized quote splitting equipment, labor, permit and add-ons.
Get at least three written bids before you sign.

Hiring

Questions to ask Mount Prospect HVAC pros

Level the field before you choose — ask each bidder the same questions and watch how the answers differ.

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 Mount Prospect

How much does furnace replacement cost in Mount Prospect, IL?

furnace replacement in Mount Prospect runs $4,900–$8,800 as of 2026, with $6,850 the figure most homeowners actually land on. Mount Prospect labor rates, the cold climate and permit fees each shift the total, and all three already sit inside this range.

Is furnace replacement more expensive in Mount Prospect than average?

Compared with the rest of the country, Mount Prospect runs about 27% higher than the national average — local labor prices at an index of 1.14 against the US average. and the local HVAC permit costs about $225.

Do I need a permit for furnace replacement in Mount Prospect?

Most Mount Prospect jurisdictions require a HVAC permit for this work. Budget roughly $225 for the permit; it is already included in the estimate above.

What affects furnace replacement cost the most?

Replacing a residential furnace, including the unit and installation labor. From there, a handful of specifics push the final number up or down. What moves the price most: equipment or material grade, your home's size and complexity, local labor rates, and the cold climate zone.

Editors' roundtable

How much should you really budget for HVAC in 2026?

What you pay for HVAC hinges less on the badge than on how the quote is built — the load calculation behind it, the efficiency tier, and the markup. Our take on where each one lands.

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.

The longevity case

The most expensive variable on the quote isn't the logo — it's whether the system is sized right and installed well. Oversize a premium unit and it short-cycles, wears fast and underperforms; commission a correctly sized mid-tier one and keep up the annual service, and it simply lasts longer. Spend on the installation, not the badge.

The budget-first case

Run a Manual J load calculation, then buy the standard tier — 80% AFUE, 14.3 SEER2 — and stop there. Where summers are short and winters are gentle, the equipment idles most of the year, so premium efficiency never gets enough runtime to earn back its price. Paying for SEER2 you'll rarely tap is the classic way a mild-climate homeowner overspends.

Our take

Climate decides the efficiency tier; a proper load calculation decides everything else. Nail both, stack the rebates you can, and you've sidestepped the two mistakes — wrong size, rushed install — that actually inflate the lifetime cost.

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 Mount Prospect using the BLS metro wage data labor index (×1.14 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 Mount Prospect 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.