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Furnace Replacement Cost Calculator

This free furnace replacement cost calculator gives you a planning estimate for replacing a gas, propane, electric or oil furnace. Choose the furnace type, size and efficiency, then set the venting, gas connection and install location. You will see a cost breakdown of equipment, labor, removal and permit with Budget, Standard and Premium project levels in about two minutes.

Free Planning EstimateDetailed Cost BreakdownBudget / Standard / Premium

Estimate My Furnace Replacement Cost

OmniEstimate · HVAC · Furnace

Furnace Replacement Cost Calculator

Price a gas, propane, electric or oil furnace with venting, removal and permit in one breakdown.

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Planning estimate only. This calculator provides a planning estimate only. It is not a quote, bid or guaranteed price. Actual contractor pricing may vary based on location, site conditions, equipment choice, labor market and project complexity. Permit amounts shown are allowances, not municipal fees. Air conditioning, ductwork replacement, gas line upgrades beyond what is selected and finish work are not included. Gas appliance work must be done by a licensed professional.

Calculator Introduction

Answer a few quick questions about your furnace replacement and the calculator estimates your cost in four steps: Location & Furnace Type, Equipment & Efficiency, Venting, Connections & Options and Labor Market & Timing. A ZIP code is required so we can match your request with local licensed professionals. It does not change the price. Only the questions that matter for your project are shown, and every setting has a sensible default, so you can get a first estimate in under a minute and then fine-tune.

How to Read Your Results

Estimated Project Budget

Your result shows an Estimated Project Budget, which is the Standard estimate, together with a typical range from Budget to Premium.

Budget

Budget assumes a basic furnace line and lean labor.

Standard — plan around this

Standard assumes a mid-grade furnace, quality venting and electrical parts and a licensed installer at typical rates. This is the best number to plan around.

Premium

Premium assumes a premium furnace, higher-grade parts and premium service.

Below the headline

Below the headline number you will see a category breakdown, a line-item table for all three project levels, and a tip based on your selections.

Live updates

Results update automatically if you change an input after calculating.

What Is Included in Each Cost Category

The breakdown only shows categories that apply to your project, so you will not see empty $0 rows.

Materials

The furnace, propane kit when selected, vent and flue parts, condensate drain, gas connector or oil line, electrical whip or heater wiring, plenum and transitions when selected, thermostat and any upgrades you select.

Labor

Installer time for the furnace, venting, gas line and plenum work, startup and combustion check.

Removal & Disposal

Disconnecting and removing the old furnace, plus disposal and recycling.

Permit / Inspection

An optional allowance only. Real fees are set by your city or county.

Additional Costs

An urgent or after-hours service premium, when selected.

Not included

Air conditioning, ductwork replacement and finish work are not included.

Request Quotes From Licensed HVAC Contractors

Use the estimate above as your planning budget, then request quotes from licensed HVAC contractors using the form below the calculator. Photos of the furnace, its data label, the flue and the gas connection help contractors quote more accurately.

How Much Does Furnace Replacement Cost?

Furnace replacement typically costs about $3,770 at the Standard level for an 80,000 BTU, 80% AFUE gas furnace that reuses the existing flue, and about $6,270 for a high-efficiency model. Across the Budget to Premium range, a gas furnace runs from about $2,405 to about $6,040 at standard efficiency.

This calculator uses the following planning figures for an 80,000 BTU furnace with standard efficiency (80% AFUE), reuse of the existing flue, a gas connection that is fine, an existing thermostat, a basement or utility-room install, existing duct connections that fit, removal of the old furnace, a permit allowance and an average labor market:

Furnace	Budget	Standard	Premium
Natural gas furnace	$2,405	$3,770	$6,040
Propane (LP) furnace	$2,540	$3,990	$6,405
Electric furnace	$1,775	$2,810	$4,610
Oil furnace	$3,455	$5,425	$8,540

Change any input and the numbers update, because the calculator prices equipment, venting, gas or oil connections, labor, removal and permit separately.

How This Furnace Replacement Calculator Works

1. Choose the furnace type

Pick natural gas, propane, electric or oil.

2. Choose size and efficiency

Select the BTU size, the efficiency level and the thermostat.

3. Describe venting and connections

Tell us how the furnace vents, how long the vent run is, whether the gas connection needs changes and whether the plenum fits.

4. Describe the location and options

Choose where the furnace sits and which upgrades you want, then set your labor market and timing.

5. See three project levels

The calculator then prices equipment and labor at planning rates and shows three project levels. Your ZIP code is used to match your request with local HVAC contractors. It does not change the price.

AFUE, in brief

AFUE stands for Annual Fuel Utilization Efficiency. It is the share of the fuel a furnace turns into heat over a season. An 80% AFUE furnace turns 80% of the fuel into heat, and a 96% AFUE furnace turns 96%.

What Affects Furnace Replacement Costs?

Furnace type

A natural gas furnace is the most common replacement. A propane furnace is the same unit with a conversion kit for LP gas, which adds a small amount. An electric furnace needs no gas or venting, which lowers its cost. An oil furnace needs an oil line, a filter and a chimney connection, which makes it the most expensive of the four.

Furnace size

Furnace size is measured in BTUs. Match the size of your old furnace unless a Manual J load calculation says otherwise. A bigger furnace is not better, because it short-cycles. For a gas furnace, the Standard estimate runs from about $3,220 for a 40,000 BTU unit to about $3,495 for a 60,000 BTU unit, about $4,045 for a 100,000 BTU unit and about $4,320 for a 120,000 BTU unit.

Efficiency level

Efficiency is measured in AFUE. A standard 80% furnace is the lowest-cost option. A high-efficiency 92 to 96% two-stage condensing furnace raises the Standard estimate from about $3,770 to about $6,270. A premium 97 to 98% modulating furnace raises it to about $7,565. The higher-efficiency units also need PVC vent pipes and a condensate drain.

Venting

An 80% furnace can often reuse the existing flue and only needs new connectors. A new stainless chimney liner raises the Standard estimate to about $4,820. A condensing furnace is vented with PVC, and the calculator prices the run by length. A high-efficiency furnace with a 30-foot vent run raises the Standard estimate to about $6,505. Choosing a condensing furnace switches the venting to PVC automatically.

Gas connection

For a gas furnace, the existing gas connection is often fine. If it needs a new fitting, a drip leg or a section of pipe, the calculator adds the parts and labor. A gas line modification raises the Standard estimate from about $3,770 to about $4,230. Larger gas line work is priced in the gas line installation calculator.

Plenum and duct transitions

If the new furnace is a different size or sits in a different position, the plenum and duct transitions may need to be rebuilt. A new plenum raises the Standard estimate to about $4,600. Ductwork replacement beyond the furnace connections is not included here.

Install location

A basement or utility room is the easy case. A closet or alcove takes more time, a crawl space more, and an attic the most. An attic install raises the Standard estimate from about $3,770 to about $4,005.

Thermostat

If you keep your thermostat, nothing is added. A programmable thermostat adds a small amount, and a smart Wi-Fi thermostat raises the Standard estimate to about $4,145.

Optional upgrades

A variable-speed blower, a media filter cabinet, a whole-home humidifier, a carbon monoxide alarm, a surge protector and a UV light or air purifier each add parts and labor. A variable-speed blower alone raises the Standard estimate to about $4,185. Upgrades appear only when they apply to the furnace type you chose.

Removal and disposal

The old furnace has to be disconnected, removed and recycled. The calculator includes this by default. If you uncheck it, the Standard estimate falls from about $3,770 to about $3,500.

Permits

Many cities require a permit and an inspection for a furnace replacement. The calculator includes a permit allowance of about $175 at the Standard level by default. If you remove it, the Standard estimate falls to about $3,595. The allowance is a planning placeholder, not the municipal fee.

Urgency

A furnace failure in winter is often an emergency. The calculator adds 15% to labor for work within about 48 hours and 40% for emergencies. An emergency replacement raises the Standard gas furnace estimate from about $3,770 to about $4,135.

Budget vs Standard vs Premium Furnace Replacement

The three project levels reflect real differences, not a simple multiplier. Use Standard as your main planning number, and the Budget-to-Premium range to see how much your choices can swing the result.

Budget

A basic furnace line and a leaner labor rate.

Standard

A mid-grade furnace, quality venting and electrical parts and a licensed installer at typical rates.

Premium

A premium furnace, higher-grade parts, more thorough commissioning and premium service rates.

Furnace vs Heat Pump

Furnace

A furnace can make more sense in very cold climates or where gas is inexpensive.

Heat pump

A heat pump heats and cools with one system. It can lower heating costs in milder climates, and many homeowners replace an old furnace and AC together.

Dual-fuel

A dual-fuel system combines the two. Use the heat pump replacement and HVAC replacement calculators to compare the options before you decide.

Regional Pricing Differences

HVAC labor rates and permit practices vary across the country. Rather than guess from your ZIP code, the calculator lets you choose a labor market, from lower-cost areas to the highest-cost metro areas, and applies it to labor and removal. A low-cost market lowers the Standard estimate to about $3,635, and the highest-cost market raises it to about $4,210. Equipment and materials are not adjusted.

DIY vs Hiring a Licensed HVAC Contractor

Replacing a furnace is not a DIY project. It involves gas connections, venting, electrical wiring and combustion testing. A mistake can cause a gas leak or carbon monoxide exposure. Most areas require a licensed contractor, a permit and an inspection. Ask the installer to test for carbon monoxide and gas leaks, and put a CO alarm near the bedrooms.

Questions to Ask HVAC Contractors

Will you perform a load calculation, and is the furnace sized correctly?
Which brand and model are in the quote, and what is the AFUE rating?
How will the new furnace vent, and where will the vent exit and the drain run?
Does the quote include removal of the old furnace, the permit and the inspection?
Will you test the combustion, check for gas leaks and install a CO alarm?
What is the warranty on parts, labor and the heat exchanger?

How to Avoid Unexpected Furnace Replacement Costs

Check the venting early. A chimney that is too large for a new furnace may need a liner.
Ask for a written scope that lists the equipment, venting, gas work, removal and permit.
Check the gas connection and the plenum before the install day.
Compare efficiency levels with your local fuel price in mind.
Do not wait for a cold snap. Emergency winter calls cost more.

Ready for a Real Quote?

Quick Answers About Furnace Replacement Costs

How much does furnace replacement cost?

Furnace replacement commonly costs about $3,770 at the Standard level for an 80,000 BTU, 80% AFUE gas furnace, and about $6,270 for a high-efficiency 92 to 96% AFUE model. At standard efficiency, the Budget to Premium range is about $2,405 to $6,040.

What does AFUE mean?

Why does a high-efficiency furnace need PVC venting?

A condensing furnace pulls so much heat out of the exhaust that the gas cools and forms acidic condensate. The cooler exhaust is vented through plastic PVC pipes, and the condensate drains away.

How much does efficiency add to a furnace replacement?

In this calculator, a high-efficiency furnace raises the Standard estimate from about $3,770 to about $6,270, and a premium modulating furnace raises it to about $7,565.

What is the biggest cost driver in furnace replacement?

The efficiency level and the venting are the biggest drivers, followed by the furnace type, the size and the gas and plenum work.

Images

No images were supplied for this page. Doc image suggestions, with alt text, are: New gas furnace installed in a utility room; PVC intake and exhaust pipes on a high-efficiency furnace; Technician installing a stainless chimney liner; Sheet metal plenum connected to a new furnace; HVAC technician testing a furnace for carbon monoxide; Furnace replacement cost by efficiency level infographic. No image files were invented or uploaded.

Furnace Replacement Cost FAQs

How much does furnace replacement cost?

In this calculator, a Standard estimate for replacing an 80,000 BTU, 80% AFUE gas furnace is about $3,770, with a Budget to Premium range of roughly $2,405 to $6,040. A high-efficiency 92 to 96% AFUE furnace raises the Standard estimate to about $6,270, and a premium 97% modulating furnace raises it to about $7,565.

How much does it cost to replace a gas furnace?

A Standard estimate for a gas furnace is about $3,770 for an 80,000 BTU, 80% efficiency unit that reuses the existing flue. Sizes range from about $3,220 for a 40,000 BTU unit to about $4,320 for a 120,000 BTU unit, and efficiency has the biggest effect on the price.

How much does an electric furnace replacement cost?

A Standard estimate for an 80,000 BTU electric furnace is about $2,810, with a range of about $1,775 to $4,610. An electric furnace needs no gas line or venting, which lowers the installation cost, but it usually costs more to run than gas.

Is a high-efficiency furnace worth the extra cost?

A 90% or higher furnace uses less fuel, but it costs more up front and needs PVC vent pipes and a condensate drain. In this calculator, high efficiency raises the Standard estimate from about $3,770 to about $6,270. The savings depend on your climate, your fuel price and how much the furnace runs.

Why does venting change the cost of a furnace replacement?

An 80% furnace can often reuse the existing flue, while a 90% or higher furnace needs PVC vent pipes. A new chimney liner raises the Standard estimate from about $3,770 to about $4,820, and a high-efficiency furnace with a 30-foot vent run is about $6,505. Your installer confirms what your home needs.

Does the furnace replacement estimate include removal of the old furnace?

Yes, by default. The estimate includes disconnecting, removing and disposing of the old furnace. Unchecking it lowers the Standard estimate from about $3,770 to about $3,500.

Do I need a permit to replace a furnace?

Many cities require a permit and an inspection when a furnace is replaced. The calculator includes an allowance of about $175 at the Standard level, and removing it lowers the estimate to about $3,595. Real fees are set by your city or county, so ask your contractor or building department.

Can I replace a furnace myself?

Furnace replacement is not a DIY job. It involves gas connections, venting and electrical wiring, and a mistake can cause a gas leak or carbon monoxide exposure. Most areas require a licensed contractor and a permit, and an unpermitted install can create problems with insurance.