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AC Installation and Replacement in Brentwood
Full system replacement for Brentwood 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 Brentwood
Multi-zone systems in Brentwood homes fail one zone at a time, and a failed zone damper reads exactly like a dead system in that part of the house. Always have the damper and zone board checked before authorizing equipment work.
- Housing stock
- Large custom and semi-custom homes on wooded, hilly lots, many with complex multi-plane roofs and multi-zone HVAC.
- Local conditions
- Heavy mature tree canopy makes limb strike and clogged-valley water intrusion the dominant roof failure mode, ahead of ordinary shingle wear.
- Permits issued by
- City of Brentwood Codes Department
- Areas we cover
- Governors Club, Annandale, Sunset Hills, Concord, Maryland Farms, Taramore and the rest of Williamson County.
On the ground in Brentwood
Most of the AC replacement calls we get out of Brentwood come from the same handful of neighborhoods: Governors Club, Annandale, Sunset Hills, Concord, Maryland Farms, Taramore. These are large custom and semi-custom homes on wooded, hilly lots, and almost none of them run on a single system. Two, three, sometimes four zones feeding different wings of the house is normal here, and that changes how a system actually fails. It rarely just quits all at once. One zone goes first, usually the bonus room over the garage or a wing that gets afternoon sun through the tree line, and the homeowner assumes the whole unit is dead when it's really one zone carrying the blame for the rest of the house.
Before you authorize a full replacement, have someone check the zone damper and control board for that section. A stuck damper reads exactly like a dead compressor from the thermostat's perspective, and we've seen people replace a perfectly good system because nobody looked at the $200 part first.
When replacement is actually the right call, a proper load calculation matters more here than in a standard subdivision house, because wooded lots and multi-plane rooflines shade rooms unevenly and throw off cookie-cutter sizing.
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 Brentwood
| 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 Brentwood?
Most Brentwood 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 an AC system in Brentwood, and does it affect equipment placement?
Yes. Full system replacements require a permit through the City of Brentwood Codes Department, and inspectors do check outdoor unit placement for clearance and drainage. In neighborhoods like Governors Club and Annandale, HOA rules on top of that often dictate condenser screening or setback from the street, so it's worth confirming both before equipment shows up on a truck.
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 Brentwood?
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.