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A compressor that sits idle for most of the calendar year faces a different failure pattern than one that runs continuously. Homes in Brookings County, SD run cooling in a single month of the year, July. Refrigerant migrates into the oil during long off periods, and when the system starts up after months dormant, that mixture runs through the compressor before it separates out. The contactor and condenser fan face the same standing-start stress every July. A contractor troubleshooting a failed unit here checks the compressor oil, the starting capacitor, and the contactor contacts before assuming the runtime hours wore anything out.
Ductwork sized and sealed for a system that was replaced at least once, possibly twice, sits behind the walls of a sizable share of homes here. Half the homes in Brookings County, South Dakota were built in 1983 or earlier (2020-2024 ACS 5-year). When the unit is opened, a contractor reads that history directly: seals that have dried and resealed, refrigerant lines that have been retrofitted rather than replaced from scratch, and parts whose availability depends on whether the manufacturer still supports that platform. The age of the equipment inside may be shorter than the age of the house around it, but the wear pattern the contractor finds reflects both.
The Parts of a Central AC a Contractor Checks First
The outdoor condenser unit sits outside the house, usually on a concrete pad at ground level, and it holds the compressor and condenser coil. The compressor is the part a contractor reaches for first when the system runs but produces no cooling. The condenser coil and its fan draw heat out of the refrigerant and release it outside, so a dirty or damaged coil shows up fast in performance.
Inside the house, the air handler holds the evaporator coil and the blower fan, mounted in a closet, attic, or utility room where the return air enters the system. The evaporator coil absorbs heat from indoor air, and a frozen or leaking coil is a common reason a system stops working. The expansion valve, refrigerant lines, and the thermostat round out what a contractor traces when isolating a fault.
The drawing shows a typical layout, and a licensed contractor determines which components apply and what condition they are in for your specific home.
Find a contractor in Brookings CountyBrookings County, by the numbers
152 severe weather events were recorded in Brookings 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 Brookings County, South Dakota were built in 1983 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesBrookings County, South Dakota holds 15,179 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 57.2% of the occupied homes in Brookings County, South Dakota (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Central AC Repair in Brookings County, South Dakota8 sourced rules and standards
What Happens When the Contractor Comes Out
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 Brookings County
Extreme weather puts real hours on cooling equipment. A system that carries a heavy load through hard conditions is one that needs honest attention when something goes wrong.
152 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.