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Sizing and installation quality decide how a central AC system holds up over years, and in Union County the compressor, condenser fan, and contactor each get a genuine workout before they rest. Homes in Union County, SD run cooling about three months a year, from June through August. A system that was undersized or poorly sealed at the refrigerant lines runs harder to keep up, and the wear that accumulates during those summer cycles does not show until the equipment tries to start again the following June. A contractor quoting a new install here has to account for that idle period: faults in wiring, contactor surfaces, and capacitors can develop during the off-season and go unnoticed until the first call of summer.
Existing ductwork is where a central AC installation either holds together or gets complicated. Half the homes in Union County, South Dakota were built in 1993 or earlier (2020-2024 ACS 5-year). Houses built around that time were ducted for whatever equipment was standard then, and the runs, returns, and sizing that made sense for that equipment do not automatically suit a modern system. A contractor measuring for a new unit has to assess what those ducts will actually carry before the equipment selection means anything. The electrical panel gets the same scrutiny, since the load a current-spec unit draws has to match what the service can deliver.
The Parts of a Central AC System and What Gets Installed
The outdoor condenser unit sits outside the house, usually on a concrete pad at ground level, and houses the compressor and condenser coil. Inside, the air handler holds the evaporator coil and the blower that pushes conditioned air through the home. These are the two main pieces a contractor sets in place.
The thermostat mounts on an interior wall and gives the homeowner control over the whole system. A contractor also installs the refrigerant line set, the copper tubing that runs between the indoor and outdoor units, along with a condensate drain line that carries moisture out of the home.
The drawing shows the general layout of a central AC system, and a licensed contractor determines what applies to your specific house.
Find a contractor in Union CountyUnion County, South Dakota, by the numbers
118 severe weather events were recorded in Union County, South Dakota 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 Union County, South Dakota were built in 1993 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesUnion County, South Dakota holds 7,588 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 73.1% of the occupied homes in Union County, South Dakota (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Central AC Installation in Union County, South Dakota8 sourced rules and standards
What Happens Once a Contractor Gets Started
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.
Severe Weather Events in Union County
Storms and temperature extremes put real hours on HVAC equipment, shortening the gap between installation and the next service call. What happens in Union County shapes what your system needs to handle, which is why local weather history belongs on a page about putting in new cooling equipment.
118 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.