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HVAC costs in Casselberry, Florida
A full AC replacement in Florida runs roughly $5,800 to $12,500 installed, with a typical 3-ton job near $8,500; ordinary repairs run $100 to $1,000. Inside Casselberry city limits add a flat $200 city mechanical permit. Those are researched market ranges and a published city fee, not our prices.
These are researched market ranges, not our prices and not a quote.
The dollar figures below come from published third-party cost guides — named and linked at the foot of the page — and from the City of Casselberry’s own published permit fee. They are here so you can tell whether a quote you have been handed is in the ordinary range for this work. They are not an offer, and no two houses in Casselberry cost the same to do.
Inside city limits the permit is a flat $200.00. Not a percentage. Not a guess.
The City of Casselberry publishes one flat fee for HVAC, grouped with Electric / Plumbing / Gas: $200.00. It does not scale with the contract, so it is the same $200 on a $6,500 changeout as on a $14,000 one. If a Casselberry-city quote shows a permit allowance of $450 “to cover permitting,” ask what the other $250 is.
If your address is in Deer Run or Fern Park (32730), this fee does not apply to you — those are unincorporated Seminole County and permit through the county Building Division in Sanford. Which desk is mine?
One flat fee, and a lot of moving parts
Every dollar figure on this site is a researched third-party range with a named source and a date, plus one figure that is not a range at all: the City of Casselberry’s published flat $200 HVAC permit fee. That is the anchor. Whatever a contractor quotes you, inside city limits the permit line should read $200.
The rest of the numbers move with the house. Casselberry’s 8,563 improved residential parcels have a median living area of 1,442 sq ft and a median build year of 1977, and both of those push a quote around more than the brand on the box does. A 1,442 sq ft block ranch with 1970s attic ductwork is not the same job as a 2,630 sq ft Legacy Park house from 2007, and it should not carry the same price.
Before you compare any number on this page, read the rebate order of operations. Duke Energy requires a free Home Energy Check completed within the previous 24 months before the equipment is installed. Replace first and apply afterwards and the claim is denied — on a strip-heat house, which is most of Casselberry’s 1970s and 80s stock, that is up to $1,000 thrown away.
Casselberry HVAC costs, summarised
| Job | Researched range | What drives it |
|---|---|---|
| Service call / diagnostic | $75–$150 | Usually credited to the repair. Higher after hours. |
| A common repair (capacitor, contactor, drain line) | $80–$450 | The bulk of what a 1970s–80s system needs before it needs replacing. |
| A major repair (coil, compressor) | $700–$3,000+ | The point at which replacement gets costed properly. |
| Full system replacement, Florida | $5,800–$12,500 | Statewide guide range; typical 3-ton job near $8,500. |
| Duct repairs added to a changeout | $1,500–$5,000 | Leaky or undersized ducts. Common in the 57.1% of the city built 1970–89. |
| City of Casselberry mechanical permit | $200.00 | Flat. Published. Not a range, and not ours. |
Repair and replacement ranges: This Old House cost guides (updated March and September 2026) and a Florida-specific cost guide checked April 2026. Permit fee: City of Casselberry Building Division. All checked September 2026.
The cheapest thing to check on a quote
| Jurisdiction | Fee as published | On an ordinary changeout |
|---|---|---|
| Casselberry | $200.00 flat | $200, whatever the job costs |
| Longwood | $246.61 flat | $246.61, whatever the job costs |
| Oviedo | $50 + $6 per $1,000 of value | about $104 on a $9,000 contract |
| Lake Mary | 0.75% of value, $35 minimum | about $68 on a $9,000 contract |
| Winter Springs | $40 application, then $60 + $15 per $1,000 | about $235 on a $9,000 contract |
| Altamonte Springs | about 2% of contract price | about $180 on a $9,000 contract |
| Seminole County (unincorporated) | county mechanical permit schedule | the desk for Deer Run and Fern Park addresses |
Casselberry has the simplest permit fee in Seminole County and one of the cheapest for a large job. Because it is flat, it does not punish a bigger or better system the way a percentage-of-contract fee does: in Altamonte Springs a $14,000 high-efficiency heat pump carries roughly $280 of permit, in Casselberry it carries $200, the same as a $6,000 builder-grade swap. That is a small number, but it is the one number on your quote that a homeowner can verify in thirty seconds.
Neighbouring-city fees are from each city’s own published schedule, linked below, captured September 2026. Percentage-based fees are worked against a $9,000 contract for comparison only.
Book the free Duke Energy Home Energy Check before you replace anything.
Duke Energy requires a free Home Energy Check completed within the previous 24 months to qualify for any Home Energy Improvement rebate. Replace the system first and apply afterwards and the application is denied — there is no retroactive path back.
It is a no-cost visit and it is the single most common way a Casselberry homeowner loses a four-figure rebate. If you are within a year of replacing, book it now, before you call anyone for a quote. Duke’s rebate line is 800.254.8535.
Want the numbers against your actual house?
Give us the subdivision and the build year. That is usually enough to say which of these bands you are in before anyone drives out.
Phone: (689) 308-3675 · Monday-Friday, 8:00 AM - 5:00 PM
Where the facts on this page come from
Every figure above is either a primary-source document or a named third-party cost guide. All of it was checked in September 2026. Fee schedules, rebate amounts and market prices change without notice — if you are about to spend money on one of these numbers, open the source and check it.
- This Old House, air conditioner repair cost guide (updated 16 March 2026)
- This Old House, HVAC replacement cost guide (updated 2 September 2026)
- I’m Moving to Florida, Florida AC replacement cost guide (reader-supported, methodology not disclosed)
- City of Casselberry Building Division
- City of Longwood fee schedule
- City of Oviedo Building Services
- City of Lake Mary mechanical permit fees
- City of Winter Springs Community Development fee schedule
- City of Altamonte Springs Building and Fire Safety
- Duke Energy, Home Energy Improvement prerequisites (Florida)
- Seminole County Property Appraiser