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Common AC problems in Casselberry, Florida
Eight symptoms that cover most residential air conditioning faults in Casselberry: no cooling, running but not cooling, not turning on, strange noises, a frozen coil, water leaks, short cycling and a sudden jump in the electric bill. Each with causes ranked and researched repair costs.
Pick the symptom
- AC not cooling at all
- AC running but not cooling
- AC not turning on
- AC making strange noises
- Frozen AC coil or iced lines
- AC leaking water
- AC short cycling
- Electric bill suddenly high
Each page follows the same shape: the symptom, the likely causes ranked by how often they actually turn out to be the answer, what you can safely check yourself, where the licensed line is, and a researched repair cost range with its source named.
The two questions behind most of these
Two questions answer more Casselberry faults than any diagnostic tool: how old is the house, and how old is the equipment. The city’s 8,563 improved residential parcels have a median build year of 1977, and 57.1% were built between 1970 and 1989.
| Your house was built | Share of city | What a Casselberry house of that vintage usually still has | What to check first |
|---|---|---|---|
| Before 1970 | 19.9% | Central air was frequently retrofitted rather than designed in. Duct runs were added to a house that was not planned around them, so returns are undersized and the supply layout is whatever fitted the attic. | Return air path and total external static pressure, before anything else. Equipment cannot fix a duct system it cannot breathe through. |
| 1970 – 1989 | 57.1% | Concrete-block ranch, straight-cool condenser with electric resistance strip heat in the air handler. Winter here is mild enough that builders rarely paid for a heat pump. The original equipment is four decades gone; the duct trunk in the attic very often is not. | Whether the house is still on strip heat. That single answer decides the size of the Duke Energy rebate and most of the operating-cost argument. |
| 1990 – 1999 | 6.2% | The smallest band in the city — Casselberry did very little building in the nineties. Heat pumps are common by this point and duct work is usually inside conditioned or semi-conditioned space. | Coil and lineset condition. These houses are typically on their second system, which is now itself at replacement age. |
| 2000 and later | 16.8% | Built to the post-2001 Florida Building Code: heat pump, interior air handler, tested duct system. Legacy Park, Grayson Square, Lost Lake Estates and the Lake Howell communities sit here. | Nothing structural. This is straight replacement-cycle work — and on the 2004-2007 houses, first-generation equipment is now at end of life. |
Seminole County Property Appraiser CAMA extract (Parcels.csv, dated 2026-09-05). Improved residential parcels — single-family, townhome and condominium — in city tax district C1, City of Casselberry. n = 8,563. Median build year is the county appraiser’s parcel figure (1977). The Census Bureau’s ACS table B25035 reads 1983 for the city on a different universe of housing units, and 1988 for both Seminole County and Florida. The two are not averaged anywhere on this site — see the source conflict, stated plainly.
Call somebody now.
A burning or hot-electrical smell. Smoke or scorching at the disconnect. A breaker that trips again immediately after being reset once. Water running into a ceiling or wall. A loud metallic grinding from the condenser. The full emergency list.
Symptom not on the list?
Describe what it is doing and when. Most faults in this housing stock narrow to two or three candidates from the description alone.
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.