An 80% efficient furnace typically costs $2,500-$6,500 installed in the United States, with an average near $4,400 for a standard gas-furnace replacement. Furnace capacity, venting, labor rates, access, and whether existing ductwork or gas lines need changes can move a quote well outside that range.
These estimates describe an 80% AFUE gas furnace, not the price of a high-efficiency condensing model.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Furnace equipment | $900 | $1,700 | $3,200 | Standard single-stage gas unit, before installation |
| Installed replacement | $2,500 | $4,400 | $6,500 | Existing compatible ductwork, ordinary access |
| Installed 80% furnace with modifications | $4,500 | $6,800 | $10,000+ | May include vent, gas, electrical, or duct changes |
| Typical furnace capacity | 40,000 BTU | 60,000-80,000 BTU | 120,000 BTU | Correct size depends on a load calculation |
What an installed 80% AFUE furnace costs
For a straightforward replacement, homeowners commonly pay $2,500-$6,500 for equipment, removal of the old furnace, standard installation labor, startup, and basic cleanup. A practical national planning figure is about $4,400. Lower quotes are more likely for a small, readily accessible unit in a lower-cost market; larger furnaces and premium controls tend to land near the top.
For a like-for-like replacement with usable connections, budget roughly $3,500-$5,500 before unusual site work.
An 80% AFUE furnace converts about 80% of its fuel energy into heat and loses the remaining 20% through exhaust. The equipment is generally a non-condensing furnace that uses metal venting. A quote should state the AFUE rating, manufacturer and model, input capacity in BTU per hour, warranty, and whether the price includes labor and disposal.
Equipment-only pricing is usually $900-$3,200 for a standard residential 80% gas furnace. That number is not the installed price: a contractor also accounts for diagnosis, removal, vent and connection checks, installation, testing, permit requirements, and business overhead. Online equipment prices may not include delivery or a labor warranty.
Assumptions: U.S. residential gas furnace, standard single-stage model, existing ducts and utilities in usable condition, and no major code or venting upgrade.
How equipment, labor, and venting appear on quotes
Quotes often combine several tasks into one installed figure. Requesting an itemized breakdown makes it easier to compare contractors and spot an allowance that omits a necessary part of the job. Costs below are typical planning ranges, not a guarantee that every contractor bills each line separately.
| Quote component | Typical price | What it generally covers | Common reason it rises |
|---|---|---|---|
| Furnace equipment | $900-$3,200 per unit | 80% AFUE gas furnace and standard controls | Higher capacity, upgraded blower, or longer warranty |
| Installation labor | $1,000-$2,500 per job | Disconnecting and setting a replacement, connections, startup | Tight access, difficult removal, or more complex installation |
| Venting and fittings | $150-$900 per job | Compatible metal vent, connectors, and adjustments | New vent route or repairs to unsafe or unsuitable venting |
| Permits and inspection | $50-$500 per job | Local permit and required inspection when applicable | Higher local fees or additional inspection requirements |
| Disposal and delivery | $100-$450 per job | Old-unit haul-away and equipment transport | Long carry, stairs, or restricted access |
| Gas, electrical, or duct work | $200-$2,000+ per job | Targeted corrections to connections or nearby ductwork | Outdated wiring, undersized gas piping, or damaged ducts |
These line items are not always additive because contractors may bundle labor, materials, and overhead. A quote with a lower furnace price can still cost more if permits, haul-away, thermostat work, or vent changes are excluded. Confirm whether sales tax applies to equipment in the local jurisdiction.
Compare the full installed scope, not just the furnace’s advertised equipment price. Ask for the model number and written confirmation of removal, venting, startup testing, permit responsibility, and warranty coverage.
Why BTU capacity and vent length change the estimate
Capacity is a major price driver, but the largest furnace available is not automatically the right choice. Residential 80% furnaces commonly range from about 40,000 to 120,000 BTU per hour. Larger input capacity can add several hundred dollars to equipment cost, while an incorrectly oversized unit may cycle frequently and provide less consistent comfort.
A contractor should size the furnace using a heating-load calculation that considers local winter temperatures, insulation, air leakage, windows, ceiling height, and house layout. Square footage can help with an early budget, but it is not a substitute for a load calculation. A 1,500-square-foot home in a mild climate may need a different capacity from one of the same size in a colder region.
Capacity, vent compatibility, and the condition of existing connections can add $300-$2,500 or more to a basic replacement.
Because 80% furnaces are non-condensing, they generally use metal venting and do not need the condensate drain associated with many high-efficiency models. That does not mean any existing chimney or vent is automatically suitable. A contractor may need to inspect its condition, dimensions, material, route, and clearance. A new vent section or liner can add about $300-$1,500; extensive correction can cost more.
Duct condition can also change the job. A small repair or adjustment may cost $200-$700, while substantial duct modifications can add $1,000-$3,000 or more. Gas piping, electrical work, return-air changes, and relocation of the furnace are separate scope items. Ask the contractor to identify the specific defect or requirement behind each proposed upgrade.
What Midwest, Northeast, and Sun Belt quotes may include
Local labor rates, permit fees, contractor availability, and equipment delivery affect installed pricing. For a standard replacement, a broad regional comparison may look like this; it is an estimate for budgeting rather than a fixed market survey.
| Market | Typical installed range | Relative to national average | Pricing context |
|---|---|---|---|
| Lower-cost rural and inland markets | $2,500-$5,200 | About 10%-20% below | Lower labor overhead, but fewer installers can limit choice |
| Midwestern and Southern cities | $3,000-$6,000 | Near the national average | Common replacement work with moderate permit fees |
| Northeast and West Coast metros | $4,000-$7,500 | About 10%-30% above | Higher wages, access costs, and local requirements |
Regional percentages can vary substantially within the same state. A city with older homes may see more vent, chimney, or access work than a newer suburb, while a rural property can incur a travel or delivery charge. Get at least two written estimates based on the same furnace capacity and scope to determine whether a quote is high for the local market.
Assumptions: Standard replacement and no major duct, chimney, gas-line, or electrical reconstruction. The regional figures are broad estimates, not official averages.
How many labor hours a furnace replacement takes
A direct swap commonly takes a two-person crew about 5-10 hours, often completed in one day. Labor may represent roughly $1,000-$2,500 of a standard installed quote, depending on local rates and the work included. The contractor should explain whether that price covers commissioning, safety checks, thermostat setup, and cleanup.
For a planning comparison, an installer’s billed labor rate may work out to roughly $75-$150 per technician-hour, although contractors often price the job as a package rather than disclose an hourly rate. Two technicians working 6 hours at a blended $100 per hour represent $1,200 in direct labor before overhead, insurance, travel, and other costs.
Installation time increases when the old unit is difficult to remove or the replacement requires venting, wiring, or duct changes. Allow an additional 2-8 hours for moderate modifications; complicated work can take more than one day. Scheduling may also be longer during a cold-weather breakdown, when demand for furnace service is high.
Three replacement quotes for different home setups
These examples show how scope changes the total. They assume an 80% AFUE gas furnace and typical U.S. labor, with permit and equipment costs included where noted. Actual quotes depend on the home, contractor, and local rules.
| Scenario | Specifications | Estimated total | Why the price differs |
|---|---|---|---|
| Small, simple replacement | 40,000 BTU; 1 unit; 5-6 labor hours; $2,500-$3,500 | $2,500-$3,800 | Existing vent, gas line, and ducts remain suitable |
| Typical suburban replacement | 60,000-80,000 BTU; 1 unit; 6-8 labor hours; $3,700-$5,200 | $3,700-$5,800 | Includes standard removal, installation, startup, and permit allowance |
| Large home with vent work | 100,000-120,000 BTU; 1 unit; 10-16 labor hours; $5,500-$8,500 | $5,500-$9,000 | Higher capacity and moderate vent or connection modifications |
The per-unit installed price often works out to around $2,500-$6,500 for a standard furnace replacement, but a simple per-unit comparison does not account for site work. In the third example, venting and added labor explain much of the difference from a like-for-like swap.
A useful comparison quote names the same capacity, model tier, permit allowance, and modification scope as the other bids. If a contractor proposes a different BTU size, request the load calculation and an explanation of the price difference.
When an 80% furnace beats a 90% replacement
An 80% AFUE furnace usually has a lower equipment price and may be a more straightforward replacement where existing metal venting is compatible. A 90%-plus condensing furnace can cost roughly $1,000-$3,000 more installed than a comparable 80% unit when new PVC venting, condensate drainage, and related changes are included. The difference depends on whether those features already exist.
Higher AFUE means more fuel energy becomes usable heat, but the purchase price alone does not show the payback. As a rough illustration, an 80% furnace requires 1.25 units of fuel input to deliver one unit of heat; a 95% furnace requires about 1.05. That is about 20% less fuel input for the same delivered heat under simplified conditions, not necessarily a 20% reduction in the total heating bill.
Compare the installed price premium with expected annual gas use, local fuel rates, and how long the system is likely to remain in service. Colder climates and high heating usage can make the efficiency difference more consequential, while a short ownership horizon or modest heating demand may make the lower initial price more important.
Repair can also be worth pricing before replacement if the furnace is relatively young and the problem is limited. A diagnostic visit commonly costs $75-$200, and repairs may range from about $150 to $1,000 depending on the part and labor. A major heat exchanger or control failure on an older unit may make a replacement quote more practical, but age alone does not establish that replacement is necessary.
How to lower an 80% furnace replacement quote
Keep the scope comparable when collecting bids. Ask each contractor to price the same AFUE rating, capacity, control type, thermostat, removal, permit, and warranty. Confirm whether the quoted furnace is single-stage or includes a variable-speed blower; those features can change the price without changing the 80% AFUE rating.
The clearest savings usually come from avoiding unnecessary scope, not choosing a furnace that is incorrectly sized. Request the load calculation and ask which proposed modifications are safety or code requirements, which are repairs to a documented defect, and which are optional improvements.
Schedule replacement before a complete winter breakdown when possible. Emergency work can restrict quote comparison and may involve after-hours charges of roughly $150-$500 or more. Off-peak scheduling does not guarantee a discount, but it can give the homeowner time to compare equipment, warranties, and labor scope instead of accepting the first available option.
Prepare a clear path to the furnace and move stored items before installation. This may reduce avoidable labor in a cramped basement or utility closet, though it will not eliminate charges for genuine removal or access work. Avoid paying for duct replacement, a new thermostat, or upgraded filtration unless the contractor explains why the existing part is incompatible, damaged, or needed for proper operation.
Ask whether haul-away, permit fees, startup testing, and a labor warranty are included. A low initial quote that excludes these items may not be the lowest final price. Compare the total with tax and stated exclusions, and request an updated written estimate before approving any extra work found after removal.