Furnace Replacement cost: Brentwood vs Knoxville (2026)
The two metros aren't quite in sync on furnace replacement: Brentwood sits 3% above Knoxville, or roughly $5,450 versus $5,300 — about $150 apart.
Brentwood TN
Typically around $5,450
Knoxville TN
Lower costTypically around $5,300
Brentwood vs Knoxville: full breakdown
| Factor | Brentwood | Knoxville |
|---|---|---|
| Typical 2026 cost | $5,450 | $5,300 |
| Estimated range | $3,900–$7,000 | $3,800–$6,800 |
| Labor index (vs US) | ×0.97 | ×0.95 |
| Climate zone | Mixed | Mixed |
| Climate factor | ×1 | ×1 |
| Local permit | $225 | $200 |
| Labor share | $3,250 | $3,200 |
| Materials/equipment | $2,200 | $2,100 |
These are 2026 planning figures for furnace replacement, localized to each city — not formal quotes.
Is the gap worth worrying about?
3% is within noise for furnace replacement — contractor selection and timing move the price more than which of these two metros you're in.
Furnace replacement by type: Brentwood vs Knoxville
Below, each furnace replacement option is priced independently for both cities, with identical local labor, climate and permit logic applied — so the comparison holds up.
| Type | Brentwood | Knoxville |
|---|---|---|
| Gas furnace | $3,800–$6,900 | $3,700–$6,750 |
| High-efficiency gas furnace | $3,400–$6,900 | $3,300–$6,750 |
| Electric furnace | $2,150–$4,550 | $2,100–$4,450 |
These are 2026 planning figures for furnace replacement, localized to each city — not formal quotes.
Furnace replacement by home size: Brentwood vs Knoxville
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.
| Size | Brentwood | Knoxville |
|---|---|---|
| 1,000 sq ft (≈45,000 BTU) | $2,950–$5,250 | $2,850–$5,100 |
| 1,500 sq ft (≈68,000 BTU) | $3,400–$6,000 | $3,300–$5,900 |
| 2,000 sq ft (≈90,000 BTU) | $3,900–$7,000 | $3,800–$6,800 |
| 2,500 sq ft (≈110,000 BTU) | $4,500–$7,950 | $4,350–$7,750 |
| 3,000 sq ft (≈130,000 BTU) | $5,050–$8,900 | $4,950–$8,700 |
| 3,500+ sq ft (≈150,000 BTU) | $5,650–$9,900 | $5,500–$9,650 |
Furnace replacement numbers here are 2026 planning ranges, adjusted per city — useful for budgeting, not a substitute for an actual quote.
What hvac pros earn in each metro
Labor is about 60% of a furnace replacement bill, so local wages drive most of the gap. These are real metro hourly wages for skilled installers (BLS OEWS), not estimates.
Nashville-Davidson--Murfreesboro--Franklin metro · about 6% below the US average installer wage.
No BLS metro wage series for Knoxville; we use Tennessee regional price parity instead.
Source: U.S. Bureau of Labor Statistics, OEWS metro wages for HVAC installers (used as a trade-labor index).
Cheapest time for furnace replacement in either city
Demand for HVAC work falls off a cliff in the shoulder months, and contractors discount to keep their crews booked. Wait for a 100-degree day or a hard freeze, though, and you're paying emergency rates for a system that just quit.
How much should you really budget for HVAC in 2026?
Three factors move an HVAC quote more than anything else: how well it's sized, which efficiency tier you pick, and the brand markup. Our editors break down how they weigh each one.
The longevity case
Brand is a footnote; sizing and install quality write the story. A right-sized mid-tier system that's properly commissioned and serviced once a year will outlive an oversized premium unit that short-cycles itself to an early grave. Put the money into the crew and the setup rather than the nameplate.
The efficiency-first case
Where you face brutal summers or hard winters, a higher SEER2/AFUE system or a heat pump runs enough hours to claw back its premium through lower bills — and utility or state rebates can still trim the sticker even though the federal 25C/25D credits closed at the end of 2025. Do the payback arithmetic before you reach for the cheapest box on the lot.
The budget-first case
Size the system to your home with a Manual J calculation and buy the standard efficiency tier (80% AFUE / 14.3 SEER2). In a mild climate the cheaper unit pays off because you rarely run it hard — paying for premium efficiency you won't use is the most common way to overspend.
The costly errors in an HVAC job are a bad load calculation and a sloppy install — not the logo you chose. Size it with a real Manual J, let your climate set the efficiency tier, and claim whatever rebates you still qualify for.
Brentwood vs Knoxville
Is furnace replacement cheaper in Brentwood or Knoxville?
Knoxville comes out ahead here, at roughly $5,300 for furnace replacement compared with $5,450 in Brentwood — a 3% ($150) gap as of 2026.
Why does furnace replacement cost more in Brentwood than Knoxville?
The main driver is local labor rates: Brentwood's labor index is 0.97 versus 0.95 in Knoxville. Climate zone (mixed vs mixed) and permit fees also shift the total.
How much is furnace replacement in Brentwood, TN?
Expect to pay $3,900 to $7,000 for furnace replacement in Brentwood in 2026, averaging around $5,450.
When is the cheapest time to buy furnace replacement — and does it differ by city?
Timing doesn't change by city here — Spring and fall (Mar–May, Sep–Oct) is the cheapest window in both Brentwood and Knoxville, saving roughly 5–15%. Avoid peak summer and mid-winter in either location, when emergency replacements push prices up.
Should I choose where to live based on furnace replacement cost?
That would be a stretch. $150 is a one-time difference, not an ongoing one, and off-season buying plus apples-to-apples bids in Brentwood can close a good chunk of it. What matters more long-term is energy costs, climate and the condition of the home.
Compare furnace replacement in other cities
Updated June 2026 · By Serhat Özçelik