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AC Installation and Replacement in Franklin
Full system replacement for Franklin 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 Franklin
Franklin's large two-story floor plans are often on a single undersized zone, which shows up as a second floor that runs 6–8 degrees warmer than the first. That is a zoning or return-air fix, not a reason to replace a working system.
- Housing stock
- Large 1990s–2000s subdivision homes across Westhaven and Cool Springs, plus a protected historic core downtown where exterior work faces additional review.
- Local conditions
- Williamson County sits in the same Middle Tennessee hail corridor as Davidson, and the county's tree cover makes wind-thrown limb damage a routine claim.
- Permits issued by
- City of Franklin Building and Neighborhood Services
- Areas we cover
- Westhaven, Cool Springs, Downtown Franklin, Fieldstone Farms, Berry Farms, Ladd Park and the rest of Williamson County.
On the ground in Franklin
Most of the replacement calls we see in Franklin come out of Westhaven and Cool Springs, where the big two-story homes built through the late 1990s and 2000s are hitting the age where the original system has been patched twice and the R-22 in it is getting harder to source. Williamson County sits in the same hail corridor as Davidson, and between storm damage and straight-up age, a lot of these systems are being replaced under real pressure rather than on a homeowner's own timeline.
One thing worth knowing before you spend money: if your second floor runs noticeably warmer than the first, that's almost always a single-zone system trying to cover a floor plan it was never sized for. It's a duct and zoning problem, not proof the unit is failing. A good contractor will size any new system by load calculation for your actual house — Fieldstone Farms and Berry Farms have different sun exposure and duct runs than Ladd Park or older Cool Springs streets, and the equipment should match the house, not a rule of thumb.
Downtown Franklin's historic core adds another layer — exterior placement of new equipment goes through additional city review, so that step needs to be planned for, not discovered mid-install.
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 Franklin
| 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 Franklin?
Most Franklin 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 permit to replace my AC unit in Franklin, and does it take longer downtown?
Yes — full system replacements require a permit through City of Franklin Building and Neighborhood Services regardless of neighborhood. In the historic downtown core, exterior condenser placement can trigger additional design review because of the district's protections, which can add time to the process. In Westhaven, Cool Springs, and similar subdivisions, permitting is usually more straightforward.
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 Franklin?
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.