Furnace Replacement cost in Knoxville, TN
Knoxville, TN · updated August 2026
$5,700
Typical local cost
$3,000 – $10,800
Typical range
- per 1,000 BTU of output
- $50 – $100
- Permit
- Yes
- Typical timeline
- 1 day of work
Installed, local pricing
$55 – $310 in fees
1 day of work, 1-3 weeks including permitting and inspection
Knoxville runs -6% against the U.S. average · data confidence Medium · modeled estimate, not a quote
The modeled midpoint for Knoxville is $5,700. The local adjustment for this trade is x0.941 — driven mainly by Knox County labor rates and 55% exposure to local code requirements.
Estimate your Knoxville job
Priced with this market's cost index, so the calculator, the size table and the ranges on this page all agree.
Estimated installed cost
$4,401 – $6,252
- Furnace and labor
- $4,517
- Venting work
- $0
- Removal and permit
- $485
Priced for Knoxville (local adjustment x0.941).
Estimates only. Local pricing, site conditions and code requirements change the real number.
Cost by project size
Generated from the same unit pricing the calculator uses.
| Project size | Estimated range |
|---|---|
| 40 1,000 BTU of output | $2,000 – $4,000 |
| 55 1,000 BTU of output | $2,800 – $5,500 |
| 70 1,000 BTU of output | $3,500 – $7,000 |
| 90 1,000 BTU of output | $4,500 – $9,000 |
| 120 1,000 BTU of output | $6,000 – $12,000 |
Based on Knoxville pricing of $50–$100 per 1,000 btu of output.
Cost by system scenario
Equipment type, tonnage and whether the ductwork or electrical has to change move HVAC pricing more than brand does. Every row is priced against the Knoxville median.
| Scope | What it includes | Typical installed cost |
|---|---|---|
| Straight equipment swap | Same tonnage, existing ducts and pad reused | $4,000 – $5,400 |
| Higher-efficiency replacement | Upgraded SEER2 tier, same configuration | $5,400 – $7,100 |
| Heat pump conversion | Electric heat pump replacing AC plus furnace or strips | $6,300 – $8,600 |
| Replacement with duct repair | Sealing, resizing or replacing failed duct runs | $7,100 – $9,700 |
| Ductless multi-zone | Three to four indoor heads, new line sets | $6,800 – $9,700 |
- • Correct sizing comes from a load calculation, not from matching the old unit's tonnage — an oversized system short-cycles and costs more to run.
- • Line-set replacement and electrical disconnect work are common add-ons on a swap that was quoted as straightforward.
- • Refrigerant transition rules mean older-refrigerant equipment is no longer a like-for-like replacement in most markets.
Basis: Each scope is priced as a multiple of the modeled Knoxville median for furnace replacement, so the scenarios, the size table and the calculator always agree. · Hometriva methodology
Where the money goes
- Labor
- $2,600
- 44% of median
- Materials
- $3,100
- 53% of median
- Permit & fees
- $185
- 3% of median
Knoxville project costs-6% vs U.S. average
Based on Knox County labor rates, local material logistics and permit-fee posture for this trade.
What the project looks like start to finish
Typical sequence for this scope. Timing varies with contractor backlog and plan-review queues.
01
Planning & quotes
Scope, material choice, contractor selection
02
Permit application
Filed with City of Knoxville building department
03
Materials & staging
Order lead time on non-stock materials
04
Installation
1 day of work, 1-3 weeks including permitting and inspection
05
Inspection
Gas line / combustion inspection, Final mechanical inspection
06
Closeout
Final sign-off, warranty and documentation
Knoxville labor intelligence
What the trade charges here, and how much of your price it is.
Loaded hourly rate
$75–$97
HVAC crews in Knox County · -10% vs U.S. ($95/hr)
Typical crew
2 × 2 days
On-site time for a typical furnace job here.
Labor in the price
$2,600
45% of the median — the rest is material, disposal and permit.
Because labor is 45% of this job, Knoxville wage levels move the price far more than material prices do. A quote well under this labor figure usually means a smaller crew, a longer schedule, or unlicensed help.
Basis: Hometriva labor model: national hvac crew rates adjusted by the Knox County labor factor (x0.896). · BLS Occupational Employment and Wage Statistics, Hometriva methodology
Why Knoxville differs from the national average
The local delta, broken into dollars by driver.
Trade labor rates-$275
Knox County crews price 10% below the national average, and labor is 45% of this job.
Material and delivery-$100
Materials are nationally traded, so they move less — but delivery into this market runs 3% under baseline.
Basis: Decomposition of the modeled Knoxville median against the U.S. median for this scope. · City of Knoxville building department, Hometriva methodology
Knoxville vs Tennessee vs the U.S.
Change the inputs, see your number
The same local model, run against your job instead of the average one.
Simulated furnace replacement in Knoxville
$5,885
Likely range $3,185 – $10,985
Simulated from the same local model as the numbers above — it changes the inputs, not the pricing method.
What makes the number move
- Input rating in BTU and the efficiency tier selected
- Condensing (90%+) furnaces requiring new PVC venting and a condensate drain
- Gas line resizing or a new sediment trap and shutoff
- Plenum, duct transition and filter cabinet modifications
- Access in a tight closet, crawlspace or attic
Who issues each permit
Tracked per discipline — the building permit issuer is not always the body that reviews electrical, plumbing, zoning or fire.
| Discipline | Issuing authority |
|---|---|
| building | City of Knoxville building departmentModeled estimate |
| electrical | City of Knoxville building departmentModeled estimate |
| mechanical | City of Knoxville building departmentModeled estimate |
| plumbing | City of Knoxville building departmentModeled estimate |
| zoning | City of Knoxville building departmentModeled estimate |
| fire | City of Knoxville building departmentModeled estimate |
Permit requirement in Knoxville
Yes — a permit is required for furnace replacement in Knoxville, TN. The work must be inspected before it can be closed out, and a licensed contractor generally has to pull the permit.
- Permitting authority
- City of Knoxville building departmentModeled estimate
- Permit fee
- Estimated allowance $55–$310Modeled from comparable fee schedules — not an official quoted fee.
Inspections
- Gas line / combustion inspection
- Final mechanical inspection
Local conditions that change this job
Only the exposures that materially affect furnace replacement.
Cooling load / heat exposure
Severe82/100
Humidity
Severe84/100
Named-storm exposure
High70/100
Knoxville sits in Knox County, Tennessee. Long cooling seasons and sustained humidity push HVAC sizing, attic ventilation and moisture detailing to the front of most exterior projects. Work outside city limits is permitted by the county building department rather than the city.
Nearby market comparison
| Market | Local factor | Median | Per 1,000 BTU of output |
|---|---|---|---|
| Knoxville (this page) | x0.941 | $5,700 | $50 – $100 |
| Asheville | x0.953 | $5,800 | $50 – $100 |
| Johnson City | x0.918 | $5,600 | $50 – $100 |
| Chattanooga | x0.941 | $5,700 | $50 – $100 |
What Knoxville homeowners actually paid
Homeowner-reported invoices for this market. Nothing is published until enough reports clear review, so this section is often empty in newer markets — adding yours takes 20 seconds and no personal details.
Quotes homeowners were given in Knoxville
Quotes run ahead of final invoices. Reporting yours shows the local spread and where there is room to negotiate.
How Hometriva estimates Knoxville furnace costs
Hometriva does not publish invented city prices. The Knoxville estimate for furnace replacement is produced by this chain, and every input is stored separately:
- National baseline$6,100
Typical U.S. cost for furnace replacement on a single-family home.
- Local labor factorx0.896
Knoxville-area trade labor rates, weighted at 45% of this job.
- Material factorx0.971
Material and delivery pricing into Knox County, weighted at 55%.
- Regulatory factorx1.007
Local code, product-approval and inspection load, applied at 55% for this project type.
- Applied multiplierx0.941
Blended Knoxville adjustment specific to furnace replacement.
- Permit component$55 – $310
Budgeted separately from the contract price because it is paid to the jurisdiction.
Because labor, material and regulatory factors are weighted per project, furnace replacement in Knoxville carries a different local adjustment than other trades in the same market.
Reviewed by
Hometriva Cost Data Desk
Maintains the unit-cost baselines, local adjustment factors and material pricing. Reviewed for furnace replacement pricing in Knoxville, TN.
- • National unit-cost baselines against current trade pricing
- • Local labor and materials factors for the market
- • Material installed-cost ranges and service life
Last reviewed August 2026 · Editorial standards · Report an error
Frequently asked questions
Does a furnace changeout need an inspection?
Yes in most jurisdictions. Combustion appliances are inspected for venting, combustion air and gas connections, and the permit is typically not closed until that inspection passes.
Is a high-efficiency furnace worth the extra cost?
It depends on how many heating hours the climate produces and the local fuel price. In cold climates the fuel saving usually repays the difference; in mild climates it often does not.
Do I need a permit for furnace replacement in Knoxville, TN?
In most jurisdictions this work is permitted and inspected. Requirements are set locally, so confirm the current application and inspection checklist with your building department before work starts.
How long does furnace replacement take?
1 day of work, 1-3 weeks including permitting and inspection. Permit review and inspection scheduling are usually the largest source of variation.
What changes the price the most?
The largest cost drivers are input rating in btu and the efficiency tier selected; condensing (90%+) furnaces requiring new pvc venting and a condensate drain; gas line resizing or a new sediment trap and shutoff.
Sources
Sources & verification
Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.