We found no government or standards-body source that measured how long ACs last in Florida or Jacksonville. The sources that do exist measure different things. They include a federal model, industry guidance and a 10-year guideline for when to consider replacement. Below, we set them side by side. Then we look at Jacksonville's weather and what the sources say about coastal installs. We also cover the upkeep that ENERGY STAR says affects a system's life.
Why AC lifespan estimates for Florida disagree
| Source | What it says | What kind of figure it is |
|---|---|---|
| U.S. Department of Energy | 18.0 years for central ACs and 15.1 for heat pumps in its hot-humid region, which includes Florida | Modeled regional average from a 2017 efficiency rule |
| The Air-Conditioning, Heating, and Refrigeration Institute (AHRI), the industry's trade association | Central AC "12- to 15- years if it is properly installed and maintained"; heat pumps "about 14 years" | General consumer guidance on an undated page |
| ENERGY STAR | Consider replacing if "Your heat pump or air conditioner is more than 10 years old" | Replacement guidance |
DOE's numbers come from a model it used to set efficiency standards in 2017. They are not a survey of homes. AHRI's page is general guidance, and it still cites a 13 SEER minimum. ENERGY STAR's 10-year figure tells you when to start weighing a replacement, not when a system will stop working.
DOE's modeled AC lifetimes and where Florida fits
DOE's 2017 direct final rule estimated the national average lifetime "to be 21 years for central air conditioners and 15 years for heat pumps." Its Table IV-16 breaks those estimates out by region. Central ACs average 21.2 years nationally, 24.1 in the North, 18.0 in the hot-humid region and 24.9 in the hot-dry region. For heat pumps, the figures are 15.3, 16.4, 15.1 and 15.4 years.
DOE's modeled average central AC lifetime by region (2017)
- National21.2 years
- North24.1 years
- Hot-humid (includes Florida)18 years
- Hot-dry24.9 years
A footnote in the same rule lists the states in the hot-humid region. They include Florida, Georgia, Alabama and Texas. So DOE's modeled figures for Florida are 18.0 years for central ACs and 15.1 years for heat pumps. The hot-humid AC figure is the lowest of DOE's regional AC figures. DOE says it adjusted each region's modeled lifetime for differences in how many hours a year systems run on average. It does not name humidity or corrosion as a cause, and we do not suggest one.
These are modeled averages for a broad region, and DOE gives no figure for Jacksonville. DOE's model also covers repairs: "Repaired units are estimated to survive an additional number of years (extended lifetime), which is on average about half of the original lifetime."
Florida is also in the federal "Southeast" region in 10 CFR 430.32. This rule sets today's minimum AC efficiency levels for each region. Its Southeast list names the same states as DOE's 2017 hot-humid region, but the two serve different purposes. Our guide to SEER2 ratings covers those minimums.
AHRI and ENERGY STAR guidance
AHRI's consumer page says, "The average life span of central air-conditioning system is 12- to 15- years if it is properly installed and maintained." It says heat pumps last "about 14 years — when recommended maintenance is followed." It adds, "Newer units manufactured in recent years are expected to last even longer," without saying which years it means.
ENERGY STAR lists "Your heat pump or air conditioner is more than 10 years old" as a reason to consider replacing.
Jacksonville's cooling season in NOAA's 1991–2020 normals
NOAA's 1991–2020 normals for NOAA's Jacksonville station (USW00013889) show 2,803.2 cooling degree days and 1,227.6 heating degree days a year. The annual average temperature is 69.3°F. The station averages 80.1 days a year with a high at or above 90°F, and 0.7 days a year with a high at or above 100°F.
Jacksonville climate normals, 1991-2020
| Cooling degree days per year | 2,803.2 degree days |
|---|---|
| Heating degree days per year | 1,227.6 degree days |
| Average days per year with a high at or above 90°F | 80.1 days |
| Average days per year with a high at or above 100°F | 0.7 days |
| July normal average high | 91.9 °F |
| August normal average high | 90.8 °F |
In NOAA's monthly normals for 1991–2020, July has a normal average high of 91.9°F and a normal average low of 73.2°F. July also has 544.0 cooling degree days. August has a normal average high of 90.8°F, a normal average low of 73.4°F and 530.1 cooling degree days.
NOAA's hourly normals for 1991–2020 put the July 15 normal at 3 p.m. local standard time at 87.7°F, with a dew point of 72.4°F. These figures describe Jacksonville's heat and humidity. No source in this guide ties that weather to a specific AC lifespan.
Salt air and coastal installs
We found no government or standards-body source that says coastal salt air corrodes AC coils or shortens AC life. Claims like that do appear online. We did not find them in a primary source, so we do not repeat them here.
DOE's Building America Solution Center has a guide on elevating and securing outdoor HVAC equipment. The Pacific Northwest National Laboratory published the guide for DOE. On the hardware that secures the equipment, it says: "In coastal areas, anchors and straps should be stainless steel or hot-dip galvanized to resist salt spray and corrosion (FEMA P-348 2017)." That sentence covers anchors and straps only. If you live near the coast, ask your installer what the anchors and straps are made of.
What shortens an air conditioner's life
ENERGY STAR's maintenance checklist names several problems that shorten equipment life:
- Dirty coils. ENERGY STAR says dirty coils "reduce the system's ability to cool your home and cause the system to run longer, increasing energy costs and reducing the life of the equipment."
- Wrong refrigerant charge. "Too much or too little refrigerant will make your system less efficient increasing energy costs and reducing the life of the equipment."
- Dirty filters. ENERGY STAR advises you to "Inspect, clean, or change air filters once a month." It warns, "A dirty filter can increase energy costs and damage your equipment, leading to early failure."
ENERGY STAR also recommends "having a contractor do annual pre-season check-ups," and says "it's best to check the cooling system in the spring." JEA's tune-up rebate page lists the checks a qualifying tune-up covers. The list includes a working thermostat, clean or replaced filters and an inspected, flowing condensate drain. It also includes clean coils with no restricted airflow, and a cleaned condenser with tight electrical connections and correct amps and volts. The last item is a check for correct pressure in the refrigerant lines. Our guide to JEA rebates covers that rebate's terms and deadline.
When to start thinking about AC replacement in Jacksonville
If your system is past the 10-year age ENERGY STAR mentions, start comparing repair and replacement. Our guide to the R-410A phase-out covers what the refrigerant rules mean for repairs and replacements. For a comparison with another hot-humid state, see our guide to how long an AC lasts in Texas.