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A contractor quoting central AC in Clark County has to size the system against what this area actually demands, not against a generic load calculation built for a milder place. 143 severe weather events were recorded in Clark County, Wisconsin between 2015 and 2024. At that rate, severe weather is a standing condition of operating here, which means a system that is even slightly undersized will run at or near its ceiling far more often than the manufacturer's duty-cycle assumptions allow. A contractor who accounts for that picks equipment and designs ductwork to handle sustained load, not occasional spikes.
Ductwork laid in for older systems was sized around what those systems moved, not what a modern central AC unit moves. Half the homes in Clark County, Wisconsin were built in 1972 or earlier (2020-2024 ACS 5-year). A contractor quoting a new installation has to assess what is already in the walls and attic before the equipment conversation can start, because duct runs that served a different system may restrict airflow or require rerouting. The electrical panel carries the same question: service installed decades before modern equipment became standard was drawn against different loads. What the house already has determines whether the installation is straightforward or whether the contractor is building around constraints the building itself sets.
What a Central AC System Is Made Of
The outdoor condenser unit sits outside the house, usually on a concrete pad at ground level, and holds the compressor and condenser coil. Inside, the air handler or furnace cabinet stands in a utility space, basement, or closet and contains the evaporator coil that does the cooling work at the air side of the system.
A refrigerant line set runs between the two units, carrying refrigerant through copper tubing that connects the outdoor and indoor coils. A thermostat on an interior wall is the control point, reading the temperature in the home and telling the system when to run.
The drawing shows a typical layout, and a licensed contractor determines which configuration and components apply to your specific home.
Find a contractor in Clark CountyClark County, Wisconsin, by the numbers
143 severe weather events were recorded in Clark County, Wisconsin 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 Clark County, Wisconsin were built in 1972 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesClark County, Wisconsin holds 14,961 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 78.5% of the occupied homes in Clark County, Wisconsin (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards Behind Central AC Work in Clark County, Wisconsin10 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 Clark County, Wisconsin
A Wisconsin business that employs a certified HVAC qualifier is a certified HVAC business, and no city or county may require it to hold a local certification or licence on top of that.
Wisconsin requires a state HVAC contractor registration: no person or business may install or service heating, ventilating or air conditioning equipment, or offer to, without one.
Severe Weather Events in Clark County
Weather puts a measurable load on HVAC equipment, and that load varies by location. What Clark County sees in a given year shapes how hard a central AC system has to work and how well it needs to be sized.
143 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.