Furnace Replacement Cost in Clarksville, Tennessee
Expect to pay $3,100 to $7,600 for furnace replacement in Clarksville, TN. Most homeowners end up near $5,600, depending on the equipment tier and how much of the old setup can be reused.
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Clarksville Weather and HVAC Load
NOAA's 1991-2020 climate normals put Clarksville at 3,756 heating degree days and 1,661 cooling degree days per year. Heating is the bigger job here, and furnaces and heat pumps in Clarksville put in far more hours than the air conditioner. Count on roughly 78 nights below 32°F and 57 afternoons past 90°F in a typical year. For a 2,000 sq ft house, this climate points to a heating load somewhere near 50,000 BTU/h. Treat that as a starting number. A Manual J calculation will move it up or down based on insulation and windows.
| Heating degree days / year | 3,756 |
|---|---|
| Cooling degree days / year | 1,661 |
| Nights at or below 32°F | 78 |
| Days above 90°F | 57 |
| Average low / high | 48.1°F / 70.2°F |
Clarksville Housing Stock
The median Clarksville home dates to 1996, according to the Census ACS. That makes the typical house about 30 years old. Plenty of houses from this period still run original 1990s or early-2000s equipment, which is past its expected service life. Owners live in 56.6% of occupied homes, roughly 37,000 households. Homes here have a median value of $236,100 and households a median income of $66,786. Those two numbers drive the labor adjustment in our estimate.
NOAA storm reports for Montgomery County show 6 hail days and 31 days with damaging thunderstorm winds over the six years from 2020 to 2025. The largest hail reported was 3 inches across. Storms here are more likely to cause power surges than coil damage, so a surge protector on the outdoor unit is worth the small cost. Montgomery County also had 2 tornado days in that period.
When Replacement Makes Sense
- A repair quote runs past a third of the cost of a new unit
- A tech found a cracked heat exchanger, or the CO detector has gone off
- The furnace is 15 to 20 years old or more
- Gas or electric bills keep climbing even though usage hasn't changed
What Moves the Price
- BTU size, which should come from a Manual J load calculation
- New PVC venting if you move to a condensing model
- Condition of the existing ductwork and any changes it needs
- AFUE rating: a basic 80% unit vs. a 96% condensing furnace
- Single-stage, two-stage or modulating gas valve
- Permit and inspection fees, which the local building department sets
For Clarksville we kept the national figures close to unchanged, based on local income, home values and climate-based equipment sizing. Get at least three written quotes; real bids can land outside this range.
What the Quote Should Cover
- The permit and the manufacturer warranty registration
- Combustion and safety tests
- The new furnace, filter rack and thermostat wiring
- Gas line and vent connections
- Removing and hauling away the old furnace
Tennessee Permits, Efficiency Rules and Rebates
Tennessee is in the DOE's Southeast region, where new split central air conditioners need at least 14.3 SEER2 (13.8 SEER2 for systems of 45,000 BTU/h and up). Plan on a mechanical permit for most replacements in Clarksville; the contractor normally pulls it. Before you sign, ask each bidder for their Tennessee license or registration number and proof of insurance. The federal 25C tax credit ended for equipment installed after December 31, 2025, so incentives now come mostly from utilities and state programs. Check your electric and gas utility's rebate page before you pick equipment.
Before You Hire
- Replace it in early fall if you can. A no-heat emergency in January costs more and leaves you fewer choices.
- Look up utility rebates on 95%+ AFUE units before you buy.
- Make sure all three quotes are for the same AFUE and staging, or you can't compare them.
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Furnace Replacement Questions from Clarksville Homeowners
How much is furnace replacement in Clarksville?
Plan on $3,100 to $7,600, with most jobs near $5,600. Equipment efficiency, house size and the condition of the ducts and wiring decide where your quote falls.
When is the best time to schedule furnace replacement in Clarksville?
Between late spring and early fall. Clarksville averages 78 freezing nights a year, and heating calls spike from November through February.
How long does a furnace replacement take?
A straight swap is usually done in one day, somewhere between 4 and 10 hours. Moving to a condensing furnace with new PVC venting can add a few more.
Is a high-efficiency furnace worth it?
In cold climates, a 95%+ AFUE furnace usually earns back the price difference in lower gas bills. Where winters are mild, the payback can take a very long time.
Furnace Replacement Near Clarksville
- Chattanooga $3,000 to $7,300
- Knoxville $2,900 to $7,200
- Memphis $2,700 to $6,600
- Nashville $3,400 to $8,400
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Clarksville Wastewater Plant; NOAA Storm Events Database 2020-2025, Montgomery County. Prices are our estimates, not contractor quotes. Updated 2026.