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Sizing a central AC system for Palm Beach County means sizing it for what the air outside actually does here, not for a mild average. 209 severe weather events were recorded in Palm Beach County, Florida between 2015 and 2024. At that rate, severe weather is a standing part of the operating environment, and a contractor who treats it as an edge case will underbuild the install. Duct layout, equipment capacity, and refrigerant line placement all get decided against that load, because a unit that fits the square footage on paper can still be wrong for the conditions outside.
Ductwork laid down for equipment that no longer exists is what a contractor runs into in a large share of Palm Beach County homes. Half the homes in Palm Beach County, Florida were built in 1986 or earlier (2020-2024 ACS 5-year). A system installed today draws on different airflow demands than whatever originally shaped those ducts, and whether the existing runs can carry the new load is what the installation turns on. The electrical side matters too, since service panels in houses of that era were not sized with modern cooling equipment in mind. A contractor who has looked at both can price the job; one who has not is guessing.
The Parts of a Central AC System a New Installation Puts in Place
The indoor air handler sits inside the home, usually in a utility closet, attic, or basement, and it holds the evaporator coil that pulls heat and humidity out of the air moving through it. The outdoor condenser unit sits on a pad beside the house and carries the compressor and condenser coil. These two units are the core of what a contractor installs.
A copper refrigerant line set runs between the indoor and outdoor units, connecting them so refrigerant can circulate through both coils. The thermostat mounts on an interior wall and gives the homeowner direct control over when the system runs and at what temperature. Both pieces are part of the installation.
The drawing shows a typical central AC layout, and a licensed contractor determines exactly what the work involves in your specific home.
Get matched in Palm Beach CountyPalm Beach County, by the numbers
209 severe weather events were recorded in Palm Beach 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 Palm Beach County, Florida were built in 1986 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesPalm Beach County, Florida holds 719,463 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 70.1% of the occupied homes in Palm Beach County, Florida (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Central AC Installation in Palm Beach County, Florida9 sourced rules and standards
What happens when the contractor shows up
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.
Licensing Rules for HVAC Work in Palm Beach 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 Palm Beach County
Outdoor conditions drive how hard cooling equipment works and how long it lasts. A system sized and installed for the actual climate here holds up differently than one built to a generic standard.
209 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.