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A contractor sizing and quoting a central AC installation here does not have to build the spec around a punishing weather history. 63 severe weather events were recorded in Martin County, Florida between 2015 and 2024. At that rate, severe weather is an event in this county, not a condition equipment runs against every week. What drives installation decisions here is the structure of the house, the load it actually puts on the system, and whether a previous install was done correctly, because those factors explain far more about how a new system will perform than the weather record does.
Ductwork laid down for an earlier generation of equipment is what a contractor hits first on most jobs here. Half the homes in Martin County, Florida were built in 1986 or earlier (2020-2024 ACS 5-year). What that means for a central AC installation is specific: the existing duct layout, sizing, and condition determine whether a new system can be connected to what the house already has, or whether sections have to be replaced before the unit goes in. The electrical is a separate question, but the duct system is usually what sets the scope. A homeowner pricing a new central AC unit is often, in effect, pricing two jobs at once.
What a Central AC System Includes
The outdoor condenser unit sits on a concrete pad beside the house and holds the compressor and condenser coil, which are the core of the system. Inside, the air handler or furnace coil assembly mounts in a closet, attic, or utility room and pulls warm air across the coil before sending it back through the house.
The thermostat goes on an interior wall where it reads the temperature and tells the system when to run. A refrigerant line set runs between the indoor and outdoor units, and a condensate drain line carries the moisture the indoor coil pulls from the air out of the house.
The drawing shows a typical layout, and a licensed contractor determines what fits the configuration of your specific home.
Get matched in Martin CountyMartin County, by the numbers
63 severe weather events were recorded in Martin County, Florida between 2015 and 2024.
NOAA National Centers for Environmental Information, Storm Events Database, bulk CSV export, events 2015-01-01 through 2024-12-31.Half the homes in Martin County, Florida were built in 1986 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesMartin County, Florida holds 83,121 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 79.6% of the occupied homes in Martin County, Florida (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards for Central AC Installation in Martin County, Florida9 sourced rules & standards
What the installation looks like
Split-system central air conditioners rated below 45,000 Btu/h manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Split-system central air conditioners rated at or above 45,000 Btu/h manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Split-system central air conditioners manufactured between January 1, 2015 and December 31, 2022 had to meet 13 SEER, the metric that preceded SEER2.
Single-package central air conditioners manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Space-constrained central air conditioners manufactured on or after January 1, 2023 must meet a federal minimum of 11.7 SEER2.
Federal efficiency standards for split-system central air conditioners and heat pumps are set on each certified combination of outdoor unit and indoor coil rather than on the outdoor unit alone.
Residential and light commercial air conditioning and heat pump systems assembled in the field, including mini-splits and unitary systems, may not be installed on or after January 1, 2025 using a refrigerant with a global warming potential above 700.
A field-assembled system whose specified components were all manufactured or imported before January 1, 2025 carries no installation compliance date under the refrigerant restrictions and may still be installed.
Contractor Rules in Martin County, Florida
Florida requires a person to be certified or registered in order to engage in the business of contracting in the state.
Severe Weather Events in Martin County
Florida's climate puts real stress on cooling equipment, and Martin County has its own weather history that shapes how hard a system has to work. What holds up here depends on what the local conditions actually demand, which is why a contractor sizing or installing equipment needs to know this area.
63 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.