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AC Installation and Replacement in Hermitage
Full system replacement for Hermitage homes, sized by load calculation rather than guesswork.
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Before you call anyone
A replacement system is the second-largest mechanical purchase most homeowners make, and the single biggest determinant of whether you are happy with it is not the brand on the box — it is whether the installer performed a genuine load calculation and did something about your ductwork. An oversized system in a Tennessee summer cools fast, shuts off before it removes humidity, and leaves you cold and clammy.
What this looks like in Hermitage
Second-generation replacements in Hermitage were often sized off the original 1970s load calculation, before anyone added insulation or replaced windows. That legacy oversizing is why so many homes here feel cold and damp at once.
- Housing stock
- Heavy 1970s–1990s subdivision stock, much of it now on its second roof and second HVAC system.
- Local conditions
- Sat in the damage path of the March 2020 tornado as it moved east through Donelson and Hermitage.
- Permits issued by
- Metro Nashville Department of Codes and Building Safety
- Areas we cover
- Old Hickory, Andrew Jackson, Tulip Grove, Dodson Chapel and the rest of Davidson County.
On the ground in Hermitage
A lot of Hermitage houses—the ones off Old Hickory Boulevard, around Andrew Jackson, Tulip Grove, Dodson Chapel—went up in the 70s and 80s and are now on their second HVAC system, sometimes their third. The first replacement usually happened without much thought: the old unit died, a contractor matched the tonnage on the nameplate, and that was that. Nobody rechecked the load after insulation got added or windows got swapped out.
Some of that turnover also traces back to March 2020, when the tornado tracked through Donelson and into Hermitage. Storm-driven replacements get installed fast, and fast jobs get sized off whatever the old system said, not off the house as it actually performs today.
That's the real reason so many Hermitage homes run cold and clammy at the same time—the equipment is oversized for the current envelope, so it blasts cool air, satisfies the thermostat, and shuts off before it ever pulls the humidity down. A proper load calculation almost always comes back smaller than what's currently installed. If a contractor quotes you before doing one, ask why.
Signs you are looking at this problem
- The system is fifteen or more years old and has needed repair two seasons running
- It uses R-22 refrigerant and has developed a leak
- Energy bills climbing year over year with no change in habits
- Rooms that have never been comfortable regardless of what you set the thermostat to
- A compressor or coil failure quoted above $1,500
How urgent is it?
Replacement is dramatically cheaper and less rushed outside of peak July and August demand.
Installed cost for identical equipment varies widely. The spread is almost entirely labor and duct scope.
What it typically costs in Hermitage
| Job | Typical range | What you should know |
|---|---|---|
| Straight AC replacement, 2–3 ton | $5,500–$9,000 | Typical for a smaller or single-story Middle Tennessee home. |
| Full system, AC plus furnace or air handler | $8,500–$14,000 | Replacing both at once costs meaningfully less than two separate jobs and avoids mismatched equipment. |
| Heat pump system | $7,500–$13,500 | Well suited to Middle Tennessee's mild winters and often the better long-run economics here. |
| Ductwork repair or partial replacement | $1,200–$5,500 | The line item most often left off a cheap bid. New equipment on failing ducts underperforms immediately. |
Middle Tennessee working ranges for planning, updated 2026. Not a quote — the contractor who does the work sets the price, and should confirm it before starting.
Facts that change the math
Since January 1, 2023, split-system air conditioners under 45,000 BTU installed in the Southeast region — which includes Tennessee — must meet a minimum of 14.3 SEER2. A contractor quoting you a lower-efficiency unit is quoting equipment that cannot legally be installed here.
New equipment has been transitioning to A2L refrigerants such as R-454B and R-32. This matters for one practical reason: the new refrigerants are not drop-in compatible with older systems, so mixing generations across a repair is not an option.
Tennessee requires a state contractor's license for projects of $25,000 or more, and a Home Improvement license for smaller residential jobs in certain counties — Davidson, Rutherford, Robertson, Knox, Shelby, Hamilton, Marion and Haywood among them. You can verify any contractor's license yourself at verify.tn.gov before you sign anything or hand over a deposit.
Questions worth asking
Ask these and you will very quickly learn whether the person in your driveway is diagnosing or selling.
- Did you perform a Manual J load calculation, and can I see it?
- What is your plan for my existing ductwork, and is it in this price?
- What refrigerant does this equipment use, and what is its long-term availability?
- What is covered by the labor warranty, and for how long, in writing?
Request a callback
Faster by phone, especially after hours — but if you would rather not call, give us the essentials and a local contractor will reach out.
Common questions
How much does a new AC cost in Hermitage?
Most Hermitage replacements fall between $5,500 and $14,000 installed, depending on system size, whether you are replacing the furnace at the same time, and how much duct work is required. Bids far below that range usually exclude ductwork, permits, or the labor warranty.
Do I need a Metro permit to replace my AC system in Hermitage?
Yes. Full system replacements in Hermitage fall under Davidson County and are permitted through the Metro Nashville Department of Codes and Building Safety, the same as anywhere else in the Metro area. A licensed contractor pulls this as part of the job, and it typically triggers a final inspection once the new system is installed and running.
What SEER2 rating do I need in Tennessee?
Since January 1, 2023, split-system air conditioners under 45,000 BTU installed in the Southeast region — which includes Tennessee — must meet a minimum of 14.3 SEER2. A contractor quoting you a lower-efficiency unit is quoting equipment that cannot legally be installed here.
Is a bigger air conditioner better?
No, and this is the most expensive misconception in the trade. An oversized unit satisfies the thermostat quickly, shuts off before it has pulled humidity out of the air, and leaves a Tennessee house feeling damp. Correct sizing beats extra capacity every time.
Do I need a permit to replace my system in Hermitage?
Generally yes. Permitting is the installer's responsibility, and an unpermitted equipment replacement can surface as a problem at resale. Ask for the permit number and keep it with your closing documents.