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Air conditioning services in Casselberry, FL
AC repair, full system replacement, heat pump conversions, duct testing and repair, scheduled maintenance and indoor air quality — residential only, in Casselberry and the unincorporated Seminole County pockets around it. Every changeout is permitted, inspected and load-calculated for the house it is going into.
AC repair
We diagnose the fault before quoting the part. The common Casselberry calls, in roughly the order they come in:
- Condensate drain blockages. A house running nine months a year in this humidity produces condensate almost continuously. A blocked drain trips the float switch and shuts the system down — or does not, and puts water in the ceiling.
- Capacitors and contactors. The classic "hums but will not start". Cheap parts, and the failure that most often gets upsold into a replacement it did not need.
- Blower and condenser fan motors. Bearing noise that follows the fan speed.
- Refrigerant leaks. On an R-410A system this is now a repair-versus-replace conversation rather than a straight repair — see repair or replace.
- Electrical and control faults, including the aftermath of a summer storm. Hurricane season here runs 1 June to 30 November and peaks around 10 September.
What AC repair costs, nationally
So you can sanity-check any quote, including ours. These are published third-party national ranges, not this company’s pricing:
| Item | National range |
|---|---|
| Diagnostic / service call | $75–$150 |
| Capacitor replacement | $150–$400 |
| Relay or contactor | $100–$450 |
| Drain line cleaning | $80–$250 |
| Blower or fan motor | $300–$800 |
| Evaporator coil | $700–$2,500+ |
| Compressor replacement | $1,000–$3,000+ |
Source: This Old House, air conditioner repair cost guide, updated 16 March 2026 — national figures. Checked September 2026. These are researched market estimates for comparison only. They are not a quote and not our pricing.
System replacement and changeouts
A changeout in Casselberry is a permitted job with an inspection at the end of it, and in a house with a 1977 median build year it is almost never a like-for-like swap. What the job actually contains:
- Load calculation on the house. Not tons per square foot. Oversizing is the single most common failure mode in this stock: the system satisfies the thermostat before it has run long enough to dehumidify, and the house ends up cold and clammy. Small Casselberry floor plans — Colonnades at around 1,044 sq ft, Marbeya Club at a median 781 sq ft — are where this goes wrong most often.
- Duct assessment. Static pressure and leakage, before equipment is selected, because the ducts set the ceiling on what the equipment can do.
- Permit. City of Casselberry at a flat $200 for HVAC, or Seminole County if your address is in one of the unincorporated pockets. Both enforce the 2023 Florida Building Code, 8th Edition.
- Equipment that is legal to install here. Southeast region minimum is 14.3 SEER2 for split systems under 45,000 Btu/hr, enforced at installation date.
- Commissioning and inspection. Charge verified, airflow measured, inspection scheduled and passed.
What a replacement costs
National: an installed HVAC system averaged $8,209, a central air conditioner $8,460 and an air-source heat pump $8,007 in a 2026 survey of 1,000 homeowners.
A Florida-specific 2026 cost guide gives $5,800–$12,500 installed statewide with a typical 3-ton job near $8,500, and notes that leaky or undersized ducts add $1,500–$5,000, and that a summer emergency replacement runs 10–20% more than the same job booked October to February.
Add the Casselberry city permit at a published flat $200 if your address is inside the city limits.
Sources: This Old House HVAC replacement cost guide, updated 2 September 2026 (national survey); a Florida statewide cost guide checked April 2026 — reader-supported, methodology not disclosed, so treat the statewide table as the weaker of the two. Its cheapest tier is quoted in SEER, not SEER2, and sits at or below Florida’s 14.3 SEER2 floor, so that tier may not represent legally installable equipment here. City permit fee: City of Casselberry Building Division. All checked September 2026. Researched market estimates, not a quote and not our pricing.
Heat pump conversions
This is the Casselberry job. January here averages a high of 71°F and a low of 52°F, so heating load is small and intermittent — which is precisely why so much of the city’s 1970s and 80s stock was built straight-cool with electric resistance strip heat in the air handler rather than as a heat pump. Strip heat is the least efficient way there is to heat a house, and 57.1% of Casselberry’s residential parcels date from that era.
Converting to a heat pump replaces the most expensive heating in the house with the cheapest, and it is the configuration Duke Energy publishes its largest Home Energy Improvement rebate for. Whether your existing ducts can carry it is a measurement, not an opinion — see the ductwork section below.
Straight-cool or heat pump?
Two quick checks you can do without tools:
- Look at the thermostat. A setting labelled EM HEAT or AUX means the house has a heat pump with backup strip heat. A plain HEAT / COOL / OFF switch with no emergency heat setting usually means straight-cool plus strip heat.
- Turn the heat on in winter and watch the outdoor unit. If the condenser outside runs while the house is heating, it is a heat pump. If only the indoor blower runs, the heat is coming from resistance elements.
If it is the second, tell us when you call. It changes the rebate, the operating cost and the whole shape of the quote.
Ductwork
In a city where 77% of homes predate 1990, ducts are the limiting factor far more often than equipment is. A 1970s duct trunk running through a vented Florida attic has spent five decades at attic temperature; the equipment attached to it has been replaced two or three times and the duct has not.
What we do: measure total external static pressure, test leakage, inspect the return path, and then tell you whether the duct system is a repair, a partial replacement or the actual job. Sealing and repairs where they will work; replacement where they will not. Duke Energy publishes a duct test and repair rebate separate from the equipment rebate, and the same Home Energy Check prerequisite applies to it.
Why an oversized system makes a Casselberry house worse
The dominant load here is latent, not sensible — humidity, not heat. Overnight lows sit at 73–75°F in summer with dewpoints in the seventies, so the air the system has to condition is wet before it is hot.
An oversized system satisfies the thermostat quickly, short-cycles, and never runs long enough to pull moisture out of the air. The result is a house that is cold and clammy, and the owner usually blames the equipment. It is the most common consequence of a rule-of-thumb, ton-for-ton changeout in this housing stock — and it is why we do the load calculation.
Maintenance
Casselberry’s cooling season realistically runs March through November: NOAA 1991–2020 normals for Orlando, the nearest long-record station, show average highs of 91–92°F from June through August and still 83–84°F in April and October. The system is never fully idle.
Scheduled service before the season, not during it. Coil cleaning, condensate drain clearing and treatment, refrigerant charge check, capacitor and contactor condition, electrical connections, airflow. On the tight, low-turnover pockets — Howell Cove, where 56 of 63 parcels are homesteaded and turnover runs about 1.6% a year — this is the whole relationship: the same owners maintaining the same houses for decades.
Indoor air quality
Filtration, dehumidification and ventilation, specified for a house that is fighting moisture. Casselberry has more than 30 lakes and ponds inside 6.97 square miles of land, so ground-level humidity and afternoon convective storms are constant.
What we will not sell you: coastal corrosion protection. Casselberry is about 40 miles inland from the Atlantic. Salt-air coil corrosion is a real problem in Brevard and Volusia and it is not a meaningful factor here — if a contractor quotes you a coastal coil coating for a Casselberry house, ask them why.
Service questions
What does a SEER rating mean for an air conditioner?
SEER is a seasonal efficiency ratio: cooling delivered over a season divided by electricity consumed. SEER2 is the current version of the test, run against a higher external static pressure that is closer to a real duct system. It matters here because the minimum is regional and Florida sits in the Southeast region: 14.3 SEER2 for split-system central air conditioners under 45,000 Btu/hr and 13.8 SEER2 at or above that, against 13.4 SEER2 in the North. Split-system heat pumps are 14.3 SEER2 / 7.5 HSPF2 nationally. Critically, in the Southeast the standard is enforced at the installation date, not the manufacture date — pre-2023 stock that is still legal to install in a northern state cannot be installed here.
When And How Frequently Should I Have My Heat Pump Or AC Unit Serviced?
Twice a year for a heat pump, because it runs in both modes, and at least once a year for a straight-cool system — with the visit timed before the season it has to survive. In Casselberry that means spring, ahead of a cooling season that realistically starts in March. Coil cleaning, condensate drain clearing, refrigerant charge, electrical connections and capacitor condition are the items that actually change between visits. Drain line work in particular is not optional here: sustained high dewpoints mean the system produces condensate almost continuously for most of the year.
Do I Need To Have The Ductwork In My Building Inspected?
If your house predates 1990 — and 77% of Casselberry's residential parcels do — yes, before you spend anything on equipment. Duct leakage and excessive static pressure cap what any new system can deliver, and a duct test is also the gateway to Duke Energy's duct test and repair rebate, which is separate from the equipment rebate. Testing tells you whether you are buying a system or buying a system plus a duct replacement, and that is a materially different number.
Can I use a heat pump with my existing ductwork?
Often, but not automatically, and the honest answer requires a measurement rather than a look. A heat pump moves more air at lower supply temperatures than the strip-heat setup it replaces, so a duct system that was marginal on cooling alone can become the limiting factor. What decides it is total external static pressure and measured leakage, not the age of the duct board. We test before quoting, and if the ducts have to be part of the job, we would rather tell you that before you sign than after the equipment is on the pad.
Short answers. Each of these questions is answered in full on the one page that owns it — SEER2 explained, Servicing frequency, Duct inspection, Heat pumps and existing ducts — and those pages, not this block, carry the FAQ structured data. The full index is at Answers.
Book a service call or a replacement quote
Repairs, changeouts, duct testing and maintenance across Casselberry, Fern Park and the surrounding Seminole County pockets.
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.