How long does an AC last in Florida?

Plan on 10 to 15 years for a central system in Florida, against 15 to 20 in a cooler state. The reason is duty cycle: a Casselberry cooling season realistically runs March to November, so the equipment does in a decade roughly what a northern system does in fifteen years.

Why Florida is shorter

Ten to fifteen years, and what ends them

There is no meter on an air conditioner, so “years” is a proxy for run hours. In Central Florida the proxy is bad in one direction: our years are longer. NOAA 1991–2020 normals for the nearest long-record station put average highs at 91–92°F from June through August and still 83–84°F in April and October. The system is never fully idle for most of the year.

What actually ends a system’s life here, roughly in order:

Compressor failure. The end point for most systems. At $1,000–$3,000+ to replace against $5,800–$12,500 for a new system, it is usually where the decision gets made. The compressor arithmetic.
Evaporator coil leaks. $700–$2,500+, and on a system past twelve years rarely worth doing alone.
Accumulated inefficiency. Not a failure at all — the system still cools, it just costs more each year to do it, and it stops keeping up on the worst afternoons.

Which one are you on

Casselberry by era

Casselberry gives you an unusually good way to think about this, because the parcel file tells you what era your house is and the era tells you which replacement you are on.

The age-of-system reality check
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.

If the house was built in 1977 — the median for the city’s 8,563 improved residential parcels — the original system is nearly fifty years gone. You are very likely on your third or fourth system, and the thing that has not been replaced three times is the duct trunk in the attic. That is usually what limits the next one.

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.

Extending it

What actually adds years

What genuinely extends a system’s life here: correct sizing so it runs long cycles rather than short ones (why oversizing is the expensive mistake); clean coils and a clear condensate path; a duct system the blower can actually breathe through; and a filter changed on a schedule that matches a nine-month season (how often).

What does not: replacing a capacitor every eighteen months. If a capacitor keeps failing, something is cooking it — usually a failing fan motor or a blocked condenser coil.

Wondering how long yours has left?

The model and serial number on the condenser gives the manufacture date. That plus the build year of the house is usually enough for a straight answer on the phone.

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Sources

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.