AC Replacement cost in St. Augustine, FL
St. Augustine, FL · updated August 2026
$9,200
Typical local cost
$5,400 – $16,100
Typical range
- per ton of cooling capacity
- $1,650 – $3,300
- Permit
- Yes
- Typical timeline
- 1 day of work
Installed, local pricing
$90 – $320 in fees
1 day of work, 1-3 weeks including permit and inspection
St. Augustine runs +4% against the U.S. average · data confidence High · modeled estimate, not a quote
The modeled midpoint for St. Augustine is $9,200. The local adjustment for this trade is x1.038 — driven mainly by St. Johns County labor rates and 55% exposure to local code requirements.
Estimate your St. Augustine job
Priced with this market's cost index, so the calculator, the size table and the ranges on this page all agree.
Recommended size
5 tons
Round to the nearest half ton
- Cooling load
- 61,000 BTU/hr
- Typical equipment costInstalled, 14-17 SEER2
- $8,823 – $16,608
- Rule-of-thumb check
- 400 sq ft per ton
Priced for St. Augustine (local adjustment x1.038).
Estimates only. Local pricing, site conditions and code requirements change the real number.
Cost by project size
Generated from the same unit pricing the calculator uses.
| Project size | Estimated range |
|---|---|
| 2 ton of cooling capacity | $3,300 – $6,600 |
| 3 ton of cooling capacity | $5,000 – $9,900 |
| 4 ton of cooling capacity | $6,600 – $13,200 |
| 5 ton of cooling capacity | $8,300 – $16,500 |
| 6 ton of cooling capacity | $9,900 – $19,800 |
Based on St. Augustine pricing of $1,650–$3,300 per ton of cooling capacity.
Cost by system scenario
Equipment type, tonnage and whether the ductwork or electrical has to change move HVAC pricing more than brand does. Every row is priced against the St. Augustine median.
| Scope | What it includes | Typical installed cost |
|---|---|---|
| Straight equipment swap | Same tonnage, existing ducts and pad reused | $6,400 – $8,700 |
| Higher-efficiency replacement | Upgraded SEER2 tier, same configuration | $8,700 – $11,500 |
| Heat pump conversion | Electric heat pump replacing AC plus furnace or strips | $10,100 – $13,800 |
| Replacement with duct repair | Sealing, resizing or replacing failed duct runs | $11,500 – $15,600 |
| Ductless multi-zone | Three to four indoor heads, new line sets | $11,000 – $15,600 |
- • Correct sizing comes from a load calculation, not from matching the old unit's tonnage — an oversized system short-cycles and costs more to run.
- • Line-set replacement and electrical disconnect work are common add-ons on a swap that was quoted as straightforward.
- • Refrigerant transition rules mean older-refrigerant equipment is no longer a like-for-like replacement in most markets.
Basis: Each scope is priced as a multiple of the modeled St. Augustine median for ac replacement, so the scenarios, the size table and the calculator always agree. · Hometriva methodology
Cost by material
Installed cost in this market, with expected service life.
| Material | Installed range | Lifespan | Maintenance |
|---|---|---|---|
| Heat Pump System | $8,300 – $12,900 | 12–18 yrs | Moderate |
| Central AC + Gas Furnace | $7,400 – $12,000 | 15–20 yrs | Moderate |
Where the money goes
- Labor
- $4,100
- 44% of median
- Materials
- $5,100
- 54% of median
- Permit & fees
- $205
- 2% of median
St. Augustine project costs+4% vs U.S. average
Based on St. Johns County labor rates, local material logistics and permit-fee posture for this trade.
What the project looks like start to finish
Typical sequence for this scope. Timing varies with contractor backlog and plan-review queues.
01
Planning & quotes
Scope, material choice, contractor selection
02
Permit application
Filed with City of St. Augustine building department
03
Materials & staging
Order lead time on non-stock materials
04
Installation
1 day of work, 1-3 weeks including permit and inspection
05
Inspection
Mechanical rough / equipment set, Electrical disconnect, Final mechanical inspection
06
Closeout
Final sign-off, warranty and documentation
St. Augustine labor intelligence
What the trade charges here, and how much of your price it is.
Loaded hourly rate
$84–$108
HVAC crews in St. Johns County · 0% vs U.S. ($95/hr)
Typical crew
3 × 2 days
On-site time for a typical ac job here.
Labor in the price
$4,100
45% of the median — the rest is material, disposal and permit.
Because labor is 45% of this job, St. Augustine wage levels move the price far more than material prices do. A quote well under this labor figure usually means a smaller crew, a longer schedule, or unlicensed help.
Basis: Hometriva labor model: national hvac crew rates adjusted by the St. Johns County labor factor (x1.000). · BLS Occupational Employment and Wage Statistics, Hometriva methodology
Why St. Augustine differs from the national average
The local delta, broken into dollars by driver.
Code and inspection load+$200
AC Replacement carries 55% exposure to local code requirements, and this jurisdiction's review load indexes at x1.04.
Material and delivery+$150
Materials are nationally traded, so they move less — but delivery into this market runs 3% over baseline because of coastal logistics.
Basis: Decomposition of the modeled St. Augustine median against the U.S. median for this scope. · City of St. Augustine building department, Hometriva methodology
St. Augustine vs Florida vs the U.S.
Change the inputs, see your number
The same local model, run against your job instead of the average one.
Simulated ac replacement in St. Augustine
$9,405
Likely range $5,605 – $16,305
Simulated from the same local model as the numbers above — it changes the inputs, not the pricing method.
What makes the number move
- System size in tons and SEER2 efficiency rating
- Heat pump versus straight cool with electric heat
- Air handler location (attic, closet, garage)
- Duct condition and any required duct replacement
- Electrical upgrades and new disconnect
Who issues each permit
Tracked per discipline — the building permit issuer is not always the body that reviews electrical, plumbing, zoning or fire.
| Discipline | Issuing authority |
|---|---|
| building | City of St. Augustine building departmentModeled estimate |
| electrical | City of St. Augustine building departmentModeled estimate |
| mechanical | City of St. Augustine building departmentModeled estimate |
| plumbing | City of St. Augustine building departmentModeled estimate |
| zoning | City of St. Augustine building departmentModeled estimate |
| fire | City of St. Augustine building departmentModeled estimate |
Permit requirement in St. Augustine
Yes — a permit is required for ac replacement in St. Augustine, FL. The work must be inspected before it can be closed out, and a licensed contractor generally has to pull the permit.
- Permitting authority
- City of St. Augustine building departmentModeled estimate
- Permit fee
- Estimated allowance $90–$320Modeled from comparable fee schedules — not an official quoted fee.
Inspections
- Mechanical rough / equipment set
- Electrical disconnect
- Final mechanical inspection
Local conditions that change this job
Only the exposures that materially affect ac replacement.
Cooling load / heat exposure
High77/100
Humidity
Severe84/100
Solar irradiance
Severe82/100
Historic district properties face additional design review that can add weeks to exterior projects.
Nearby market comparison
| Market | Local factor | Median | Per ton of cooling capacity |
|---|---|---|---|
| St. Augustine (this page) | x1.038 | $9,200 | $1,650 – $3,300 |
| Jacksonville | x0.985 | $8,800 | $1,600 – $3,150 |
| Daytona Beach | x1.014 | $9,000 | $1,600 – $3,250 |
| Gainesville | x0.948 | $8,400 | $1,500 – $3,050 |
What St. Augustine homeowners actually paid
Homeowner-reported invoices for this market. Nothing is published until enough reports clear review, so this section is often empty in newer markets — adding yours takes 20 seconds and no personal details.
Quotes homeowners were given in St. Augustine
Quotes run ahead of final invoices. Reporting yours shows the local spread and where there is room to negotiate.
How Hometriva estimates St. Augustine ac costs
Hometriva does not publish invented city prices. The St. Augustine estimate for ac replacement is produced by this chain, and every input is stored separately:
- National baseline$8,900
Typical U.S. cost for ac replacement on a single-family home.
- Local labor factorx1.000
St. Augustine-area trade labor rates, weighted at 45% of this job.
- Material factorx1.029
Material and delivery pricing into St. Johns County, weighted at 55%.
- Regulatory factorx1.040
Local code, product-approval and inspection load, applied at 55% for this project type.
- Applied multiplierx1.038
Blended St. Augustine adjustment specific to ac replacement.
- Permit component$90 – $320
Budgeted separately from the contract price because it is paid to the jurisdiction.
Because labor, material and regulatory factors are weighted per project, ac replacement in St. Augustine carries a different local adjustment than other trades in the same market.
Reviewed by
Hometriva Cost Data Desk
Maintains the unit-cost baselines, local adjustment factors and material pricing. Reviewed for ac replacement pricing in St. Augustine, FL.
- • National unit-cost baselines against current trade pricing
- • Local labor and materials factors for the market
- • Material installed-cost ranges and service life
Last reviewed August 2026 · Editorial standards · Report an error
Frequently asked questions
Do I need a permit to replace an AC unit?
Yes. A mechanical permit is required for a residential air conditioner changeout in every Florida jurisdiction, and the work must be inspected. Licensed HVAC contractors pull this permit as part of the job.
What size AC do I need in Florida?
A rough Florida rule of thumb is one ton of cooling per 500-600 square feet of conditioned space, but proper sizing uses a Manual J load calculation that accounts for insulation, window area, orientation and ceiling height. Oversized systems short-cycle and fail to remove humidity.
How long does an AC last in Florida?
Because systems run nearly year-round and coastal salt air accelerates corrosion, Florida air conditioners typically last 10-15 years versus 15-20 in cooler climates.
Sources
Sources & verification
- City of St. Augustine building department
- St. Augustine permit portal
- Florida Building Commission
- BLS Occupational Employment and Wage Statistics
Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.