How much does a new gas furnace cost?
$2,000 – $5,200 standard-efficiency unit replacement cost
$3,300 – $6,900 high-efficiency system installation cost
New gas furnace prices
A new gas furnace costs $2,000 to $5,200 on average to replace a standard unit. A high-efficiency gas furnace costs $3,300 to $6,900 installed. New gas furnace prices are $800 to $2,700 for the unit plus $900 to $3,000 for the install labor.
Installing a natural gas furnace with new ductwork costs $4,400 to $11,800.
Mobile home gas furnaces cost $900 to $2,500.
|Home size (Square feet)||Unit cost*||Total replacement cost*|
|1,300 – 1,600||$600 – $2,200||$1,800 – $5,200|
|1,600 – 1,900||$650 – $2,400||$1,850 – $5,400|
|1,900 – 2,200||$700 – $2,500||$1,900 – $5,500|
|2,200 – 2,600||$800 – $2,700||$2,000 – $5,700|
|2,600 – 3,200||$900 – $2,800||$2,100 – $5,800|
*Prices depend on the brand, size in BTUs, and efficiency.
Gas furnaces are the most common and last 15 to 25 years.
The cost to run a natural gas furnace is $400 to $700 annually, or 30% to 85% cheaper than oil, electric, or propane furnaces.
The best gas furnace brands are Payne, Rheem, Ruud, Trane, American Standard, and Bryant.
Compare furnace replacement costs for all fuel types, including gas, oil, and propane.
Average gas furnace prices
The following table shows the average price to replace a natural gas furnace, including the unit and labor.
|National average cost||$3,600|
|Average range||$2,000 to $5,200|
*Based on research and project costs reported by HomeGuide members.
Natural gas furnace cost
Natural gas furnace prices are $600 to $3,300 without installation, depending on the brand, size in BTUs, efficiency, and features.
New gas furnace prices by BTU
An average 66,000- to 80,000-BTU furnace costs $1,900 to $5,200 installed. Gas furnaces typically range from 40,000 to 140,000 BTUs. Contractors size the furnace based on the home’s square footage, insulation, climate zone, and heating needs.
|Furnace size (BTU)||Average unit cost*||Total replacement cost*|
|40,000||$600 – $1,700||$1,800 – $4,700|
|50,000||$650 – $1,800||$1,850 – $4,800|
|60,000||$700 – $1,900||$1,900 – $4,900|
|70,000||$800 – $2,000||$2,000 – $5,000|
|80,000||$900 – $2,200||$2,100 – $5,200|
|90,000||$1,000 – $2,400||$2,200 – $5,400|
|100,000||$1,100 – $2,500||$2,300 – $5,500|
|120,000||$1,200 – $2,700||$2,400 – $5,700|
|140,000||$1,300 – $2,800||$2,500 – $5,800|
*Based on average prices for both standard and high-efficiency gas furnaces.
Forced-air gas furnace price comparison by brand
A new forced-air gas furnace costs $800 to $2,700 on average, depending on the brand, size, and efficiency. Bryant or Lennox furnace prices are $800 to $7,500, while Goodman furnace prices are $600 to $3,200 on average.
The following chart shows the top gas furnace brands and prices, without installation labor:
|Brand||Standard unit price||High-efficiency unit price|
|AirQuest||$650 – $1,700||$1,000 – $2,500|
|American Standard||$850 – $2,600||$1,100 – $3,000|
|Blueridge||$600 – $1,100||$900 – $2,000|
|Bryant||$800 – $2,200||$2,000 – $3,400|
|Carrier||$1,000 – $1,600||$1,400 – $2,800|
|Century||$1,000 – $1,300||$1,300 – $1,500|
|Direct Comfort||$600 – $1,500||$900 – $2,500|
|Goodman||$600 – $2,000||$1,000 – $3,200|
|Lennox||$1,400 – $3,000||$1,700 – $7,500|
|MRCOOL||$800 – $1,100||$1,000 – $1,500|
|Rheem / Ruud||$800 – $3,200||$1,300 – $3,900|
|Royalton||$1,300 – $1,700||$1,900 – $3,200|
|Trane||$1,200 – $1,900||$1,600 – $3,000|
|Winchester||$1,200 – $1,500||$1,600 – $3,400|
|York||$800 – $1,500||$1,200 – $2,000|
*Installation labor adds $900 to $3,000 on average.
Gas furnace manufacturers' warranties are typically 5 to 12 years for the main components and 20 years for the heat exchanger. Many brands offer optional extended warranties.
Contractors often include a 1-year warranty on installation labor.
Mobile home gas furnace prices
Mobile home gas furnace prices are $900 to $2,500, depending on the brand and energy efficiency. Mobile home furnaces range from 80% to 95% in efficiency (AFUE). Downflow furnaces are the most common type since many mobile homes have ducts under the floors.
|Coleman||$900 – $1,200|
|Miller||$1,700 – $2,300|
|Revolv||$1,000 – $2,500|
|Alpine||$1,000 – $1,700|
*Not including installation.
High-efficiency furnace costs
A high-efficiency furnace costs $3,300 to $6,900 installed, depending on the brand, size, AFUE rating, and features. High-efficiency gas furnaces cost 30% to 50% more up front to install but save $100 to $200 per year on operating costs.
|Type||AFUE||Unit cost||Total replacement cost|
|Standard efficiency||80% – 89%||$600 – $1,900||$2,000 – $5,200|
|High-efficiency||90% – 99%||$900 – $3,300||$3,300 – $6,900|
A high-efficiency gas furnace is worth the cost for these extra benefits:
Multiple fan speed options to save electricity costs
Variable heat settings such as two-stage or multi-speed blowers to lower natural gas bills
A secondary heat exchanger costs $1,000 to $2,000 to prevent heat loss through vents
Condensation-drain design to reduce emissions
The Annual Fuel Utilization Efficiency (AFUE) rating measures the energy efficiency of furnaces. A higher AFUE percentage produces more heat with less fuel, lowering fuel costs. A furnace with an AFUE of 90 turns 90% of its fuel into usable heat.
High-efficiency furnaces have an AFUE in the 90's. Furnaces in the 80's are standard-efficiency.
Furnaces lose heat through air leaks, inefficient burners, exhaust, or a less-advanced design.
A high-efficiency unit may be eligible for an Energy Star federal tax credit of up to $300 and other local rebates.
Hybrid heating or dual-fuel systems that use an air-source heat pump and gas furnace are the most energy-efficient. Adding a heat pump costs $2,500 to $6,000 more.
Cost factors to replace a gas furnace
The cost to replace a gas furnace depends on the unit’s efficiency and size in BTUs, ductwork modifications, labor, permits, and installation complexity.
|Removal & disposal old furnace||$150 – $400|
|Basic furnace install labor cost||$900 – $3,000|
|Permits & fees||$250 – $1,500|
|New duct installation||$2,400 – $6,600|
|Duct replacement||$1,400 – $5,600|
|Cleaning ducts||$300 – $700|
|Insulation replacement||$900 – $3,000|
|Zoning system||$2,000 – $3,500|
|Home energy audit||$200 – $500|
|Asbestos inspection / testing||$250 – $700|
|Asbestos abatement||$700 – $2,200|
|Chimney liner||$900 – $3,800|
|Thermostat replacement||$140 – $350|
Gas furnace ductwork cost
The cost to install a new gas furnace and ductwork is $4,400 to $11,800. Replacing a gas furnace sometimes includes removing old ducts or cleaning the existing ductwork for better airflow, especially in older homes.
Installing new ducts costs $2,400 to $6,600.
The cost to replace ductwork is $1,400 to $5,600 or $25 to $55 per linear foot.
Duct cleaning costs $300 to $700 total or $25 to $45 per vent to keep the system running efficiently and maintain good air quality.
Duct repair costs $200 to $700, depending on the duct type, location, and size.
Ductwork sealing costs $400 to $2,700 to fix vent leaks.
Asbestos inspection and testing costs $250 to $700 and is important for homes built before or during the 1970s.
Asbestos abatement costs $400 to $2,700 when replacing ductwork.
A home energy audit costs $200 to $500 to check for leaks and efficiency optimizations.
Gas furnace labor installation cost
Gas furnace installation labor costs $900 to $2,200 alone for standard-efficiency models or $1,200 to $3,000 for high-efficiency systems. Gas furnace installations take 4 to 10 hours on average. High-efficiency units take longer due to the complexity and additional vents required.
Furnace services cost $75 to $150 per hour on average, not including parts.
|Standard efficiency||$900 – $2,200|
|High-efficiency||$1,200 – $3,000|
An HVAC contractor charges $75 to $150 per hour, plus $30 to $50 per hour for an assistant.
Electrical work costs $100 to $250 minimum for gas-furnace control connections.
Most contractors include gas and carbon monoxide testing in their installation price.
Installing new insulation costs $900 to $3,000 on average.
Installing a chimney liner costs $900 to $3,800 and prevents masonry damage from the moisture in the natural gas exhaust.
Thermostat replacement costs $140 to $350 on average.
An HVAC zoning system costs $1,700 to $4,500 installed. Zoned houses have 30% lower energy bills through controlled heating and cooling of each room.
Removing a gas furnace cost
Removing and disposing of an old gas furnace costs $150 to $400, depending on the size, location, and local disposal fees. Extra fees apply when removing from areas with limited access. Most contractors include this service in their estimate.
Upflow vs. downflow gas furnace
The difference between an upflow and downflow furnace is the position of the hot-air supply vent, which depends on the home's ductwork layout. Most upflow and downflow gas furnace units cost the same price. Downflow units are the best option for attics, but basements need upflow units.
Permits and inspection fees
Gas furnace permits and inspections cost $250 to $1,500, depending on the location and whether the project is a replacement or new installation. All gas furnace replacements, installations, and gas line repairs require permits. Contractors typically pull all permits.
Additional permits may apply:
Electrical permits cost $50 to $350+ when upgrading electrical connections.
Gas line permits cost an extra $50 to $200. Lower fees are for connecting to existing gas lines, and higher fees apply for installing new gas lines.
Gas furnace conversion costs
The cost to convert a propane furnace to natural gas is $650 to $1,500 to install a conversion kit, remove the propane tank, and install a gas line.
Converting an oil furnace to gas costs $2,200 to $8,800 and requires replacing the furnace, removing the oil tank, and installing natural gas lines.
Converting an electric furnace to gas costs $1,800 to $5,300 and includes replacing the furnace and installing natural gas lines.
|Conversion type||Average cost*||Typical work involved|
|Oil to gas||$2,200 – $8,800||
|Electric to gas||$1,800 – $5,300||
|Propane to gas||$650 – $1,500||
|Gas to propane
|$1,900 – $4,900||
|Gas to propane
|$275 – $800||
*Prices don’t include new gas line installations and piping extensions.
Additional costs may include:
A new gas line installation costs $500 to $2,000 total or $12 to $25 per linear foot.
Furnace conversions sometimes require new ductwork. Ductwork replacements cost $1,400 to $5,600 on average.
Oil tank removal costs $1800 to $3,400 for an underground unit or $400 to $1,800 for an above-ground model. Oil tank removal is mandatory in most states for safety reasons.
Switching to natural gas may require a chimney lining to prevent masonry damage. A new chimney liner costs $900 to $3,800 installed.
Propane gas furnace
Propane furnace costs are equal to natural gas, and both use the same furnace. Converting a gas furnace to propane costs $150 to $500 to install a conversion kit, plus $50 to $200 annually for renting a propane tank.
Operating cost to run a gas furnace
Operating a gas furnace costs $400 to $700 per year in energy costs. Natural gas heating is 30% to 85% cheaper than oil, electric, or propane furnaces. Operating costs depend on the home’s size, climate, local fuel prices, and the furnace’s energy efficiency.
|Fuel type||Annual cost to run|
|Natural gas||$400 – $700|
|Propane||$1,000 – $2,500|
|Oil||$1,000 – $1,750|
|Electric||$1,600 – $2,200|
Are propane furnaces more efficient than natural gas?
Propane furnaces are more efficient and use 2.0 to 2.5 times less fuel to heat a home than natural gas heating. Although propane has a higher BTU heating-efficiency rating, propane costs 2 to 3 times more to operate than natural gas.
What size gas furnace do I need?
The most cost-effective gas furnace size needs 20 to 60 BTUs per square foot, depending on the climate zone. An average 1,600- to 2,600-square-foot home needs a 40,000- to 130,000-BTU gas furnace. The home’s size, climate, and level of insulation determine the furnace size needed.
|Home size (square feet)||BTU output needed*|
|1,200 – 1,600||30,000 – 80,000|
|1,600 – 1,900||40,000 – 95,000|
|1,900 – 2,200||45,000 – 110,000|
|2,200 – 2,600||55,000 – 130,000|
|2,600 – 2,800||65,000 – 140,000|
*Based on the average 25 to 50 BTUs per square foot.
Gas furnace FAQs
How much does a 3-ton gas furnace cost?
A 3-ton (36,000 BTU) gas furnace costs $600 to $1,700 without installation, depending on the brand and efficiency. Furnace sizes are measured using BTUs. One ton is equal to 12,000 BTUs. Suppliers typically use the “ton” metric for comparing AC unit cooling capacities.
What is the best gas furnace to buy?
The best gas furnace brands are Payne, Rheem, Ruud, Trane, American Standard, and Bryant, according to consumer ratings. Furnaces with variable-speed blower motors and modulating gas valves have a wider range of heat settings for precise temperature control.
What is a cheap gas furnace price?
A cheap gas furnace for a house costs $600 to $1,000 for standard 80% efficiency models from brands like Goodman, Direct Comfort, and Blueridge. Cheap gas furnaces have single-stage or multi-speed motors and valves, which allow only 1 to 2 heat settings.
How long does a gas furnace last?
A gas furnace lasts 15 to 25 years on average. The lifespan depends on the brand, quality, usage, location, and maintenance frequency. A properly sized gas furnace system with annual maintenance lasts the longest.
Warning signs to replace a gas furnace:
Persistent gas odors around the furnace
Yellow pilot light instead of blue
Loud, unusual furnace noises
Cracks and rust on the furnace housing
Only cool air from vents
Drastically higher monthly gas bills
Does a gas furnace use electricity?
A gas furnace needs electricity to run the fan motor, igniter, circuit boards, and relays.
Hiring a gas furnace installer
Hiring an experienced furnace installer is essential for safety and quality. Homeowners cannot legally install gas furnaces on their own due to the fire hazards and risks of carbon monoxide poisoning from faulty installations.
When selecting a furnace contractor:
Verify the contractor and their crew all have licenses, insurance, and bond guarantees.
Choose HVAC installers with credentials from organizations like North American Technician Excellence (NATE) and the American Society of Heating, Refrigeration, and Air-Conditioning Engineers (ASHRAE).
Look for furnace technicians with 2 to 5 years of experience minimum.
Compare bids from at least three contractors.
Request copies of itemized estimates, heating-load calculations, billed orders, permits, warranties, and contracts.
Beware of the lowest estimates that often mean lower-quality installations.
Read their reviews on HomeGuide and Google.
Understand the total project cost before signing contracts.
Avoid paying in full before the project starts. Make a payment schedule for work completed to avoid scams.
Questions to ask
Which gas furnace brands do you install?
How many gas furnace installations have you done?
Can I see a list of references from your past projects?
Does this furnace qualify for local tax credits or rebates?
Will you manage an electrician for the furnace hookups to thermostats?
What types of furnace repairs does your warranty cover?
Will you size the new gas furnace using a Manual J load calculation?
How much will permits and inspections cost?
Does your estimate include all labor, materials, cleanup, and equipment fees?
Does your estimate include disposing of the old furnace?
How long will the installation take?
Does my contract guarantee the exact make, model number, and energy rating of my new gas furnace?
Will you check for issues with electrical connections, ductwork, or gas lines before the installation?
Do I need ductwork modifications to connect to the new furnace?
Does my ductwork need extra sealing?
Will you test my air quality after installation for carbon monoxide leaks?
Do you offer an ongoing service plan for this furnace?
What financing plans do you offer?