Tell us about the job
Takes about a minute. No obligation.
Sizing a central AC system in Washington County starts with what the house actually needs, and the local weather record is one part of that picture, not the whole story. 74 severe weather events were recorded in Washington County, Alabama between 2015 and 2024. At that rate, severe weather is a periodic presence rather than a constant one, and a contractor working an installation quote cannot point to climate load as the primary variable shaping equipment choice. Duct layout, insulation, and the age of the existing air handler carry more weight in deciding what gets specified and how it gets installed.
Ductwork laid out for an older generation of equipment does not automatically carry a new central AC system without adjustment, and in Washington County that gap is common enough to be the first thing a contractor prices, not an afterthought. Half the homes in Washington County, Alabama were built in 1984 or earlier (2020-2024 ACS 5-year). That means a substantial share of the houses a contractor walks into here have duct runs that were never designed for current equipment loads. The electrical service follows the same logic: panels from that era were sized for what was standard then. Before a new unit ever gets quoted, a contractor has to establish whether the existing ductwork and electrical can carry it, or whether that work goes on the bill too.
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, the two components that do the heaviest work in the system. Inside, the air handler or furnace-based coil cabinet stands in a utility closet, basement, or attic and pairs with the outdoor unit to complete the refrigeration circuit.
The refrigerant line set runs between the two units, carrying refrigerant through insulated copper tubing that gets routed along the exterior wall or through a chase inside the house. A thermostat mounts on an interior wall and gives the homeowner direct control over the system.
The drawing shows a typical layout, and a licensed contractor determines exactly what fits and where in your house.
Get matched in Washington CountyWashington County, Alabama, by the numbers
74 severe weather events were recorded in Washington 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 Washington County, Alabama were built in 1984 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesWashington County, Alabama holds 7,797 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 85.8% of the occupied homes in Washington County, Alabama (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Central AC Installation in Washington 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 and Legal Requirements in Washington 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 History in Washington County
Weather events put real stress on cooling equipment, and Washington County's climate shapes how hard a central AC system has to work over its lifetime. Installation decisions made here account for that local load.
74 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.