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A contractor quoting central AC installation in Mobile County is not solving a generic climate problem. 238 severe weather events were recorded in Mobile County, Alabama between 2015 and 2024. At that rate, severe weather is a regular feature of what any system here runs against, and it shapes the installation before the unit is ever chosen. Proper sizing for this area accounts for a real and recurring load. A poorly matched system, or one with a weak duct seal, gives out under conditions the county sees routinely, and no amount of brand quality fixes that.
Ductwork laid down for equipment generations removed from what runs today is what a contractor has to evaluate before any other question gets answered. Half the homes in Mobile County, Alabama were built in 1980 or earlier (2020-2024 ACS 5-year). That history means the duct layout, the trunk sizing, and the returns in a typical house here were designed around specifications a new central AC system does not share. A contractor quoting an installation has to measure what is there, not assume it transfers. Whether the existing ductwork carries the load of a new system is the question that shapes the job, and it gets answered by opening registers and running calculations, not by looking at the unit on the proposal.
What Gets Installed With a New Central AC
The outdoor condenser unit sits on a concrete pad beside the house and holds the compressor and condenser coil. Inside, the air handler mounts in a utility closet, attic, or basement and contains the evaporator coil and blower that moves conditioned air through the home. 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 through an exterior wall. The thermostat mounts on an interior wall and gives the homeowner control over the whole system. A condensate drain line also runs from the air handler to carry moisture out of the house.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your house.
Get matched in Mobile CountyMobile County, by the numbers
238 severe weather events were recorded in Mobile County, Alabama 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 Mobile County, Alabama were built in 1980 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesMobile County, Alabama holds 186,082 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 66.0% of the occupied homes in Mobile County, Alabama (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards for Central AC Installation in Mobile County, Alabama9 sourced rules and standards
What the Installation Actually 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.
Licensing Rules for HVAC Work in Mobile County, Alabama
Alabama requires state certification to do heating, air conditioning and refrigeration contracting: nobody may advertise, bid, pull permits or do the work unless the person in responsible charge is a certified contractor.
Severe Weather Events in Mobile County
Cooling equipment in Mobile County works against the full weight of the local climate, not just summer heat. Weather stress accumulates in the hardware, and what the sky does here shapes what size, grade, and installation approach a system actually needs.
238 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.