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Sizing a central AC system in Greene County starts from what the local climate actually asks of the equipment, and that question has a concrete answer. 39 severe weather events were recorded in Greene County, Alabama between 2015 and 2024. At that rate, severe weather is an occasional event here, and a contractor drawing up an installation does not need to build around a punishing cumulative load. Age of the existing equipment, quality of the prior install, and duct condition are what drive the replacement conversation. A new system sized and installed correctly for this area is not fighting unusual odds from day one.
Ductwork in houses this old was designed around equipment that bears little physical resemblance to a modern central AC unit, and that gap is where an installation job either holds together or comes apart. Half the homes in Greene County, Alabama were built in 1981 or earlier (2020-2024 ACS 5-year). A contractor quoting a new system has to assess what the existing duct runs can carry before the new unit is ever ordered, because undersized or deteriorated ductwork will fight a correctly sized system and leave the house uncomfortable regardless of what was installed. The electrical panel gets the same scrutiny, since the load a modern unit draws often exceeds what the original service was built to handle.
What Gets Installed With a New Central AC
The outdoor condenser unit sits on a concrete pad outside the house and holds the compressor and condenser coil, which do the heaviest work of the system. Inside, the air handler or furnace cabinet stands in a utility closet, basement, or attic and houses the evaporator coil and blower that push conditioned air through the home.
The thermostat mounts on an interior wall and gives the homeowner control over the whole system. A refrigerant line set runs between the outdoor and indoor units, and a condensate drain line carries moisture pulled from the air to a nearby floor drain or outside.
The drawing shows the general layout of a central AC system, and a licensed contractor determines exactly what applies to your house.
Get matched in Greene CountyGreene County, by the numbers
39 severe weather events were recorded in Greene 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 Greene County, Alabama were built in 1981 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesGreene County, Alabama holds 4,279 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 61.6% of the occupied homes in Greene County, Alabama (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards Behind Central AC Installation in Greene County, Alabama9 sourced rules and standards
What HVAC Installation Looks Like in Greene County
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 Greene 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 Greene County
Alabama's climate puts real load on central AC systems, and Greene County's weather history is part of what determines how hard that equipment has to work. Sizing and installing a system here without accounting for local conditions produces a system that fits the average, not the place.
39 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.