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A furnace in this area runs its burner and heat exchanger hard across most of the calendar year. Homes in Brookings County, SD run heat about nine months a year, from September through May. That load cycles the ignition system repeatedly, and the heat exchanger expands and contracts every time the burner fires and shuts off. A contractor diagnosing a repair here checks those components for fatigue cracks and carbon buildup before pricing anything else, because a part that looks marginal at the start of the season is often the reason the system failed by the end of it.
Ductwork laid out for an older furnace generation tends to run with restricted airflow by today's standards, and that restriction puts steady pressure on the heat exchanger and burner assembly year after year. Half the homes in Brookings County, South Dakota were built in 1983 or earlier (2020-2024 ACS 5-year). A contractor opening a furnace in this county finds components that have logged a full working life under those conditions, and what they find inside determines whether a part swap closes the job or whether the exchanger itself has cracked from the cycling load. Parts availability for equipment of this vintage varies by manufacturer and model, so the repair scope is not settled until the unit is open and the serial information is in hand.
The Parts of a Furnace a Contractor Checks First
The furnace itself sits in the basement, utility room, or garage and is the heart of the repair call. Inside it, the heat exchanger is the piece a contractor reaches for early: cracks or corrosion there mean combustion gases can leak into living air. The burners, which ignite the fuel that heats that exchanger, are another frequent source of trouble when a furnace runs poorly or not at all.
The blower motor sits at the base of the furnace cabinet and pushes conditioned air out through the house. Alongside it, the draft inducer pulls exhaust gases out safely, and the control board ties every component together by reading sensors and sending signals. When any one of these stops doing its job, the board often logs a fault that tells a contractor where to look.
The drawing shows a typical furnace layout, and a licensed contractor determines which components apply to your specific system and situation.
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 Behind Furnace Repair in Brookings County, South Dakota4 sourced rules and standards
What happens when a contractor comes out
Non-weatherized gas furnaces manufactured on or after November 19, 2015 must reach 80.0 percent AFUE.
Non-weatherized oil-fired furnaces manufactured on or after November 19, 2015 must reach 83.0 percent AFUE.
Mobile home gas furnaces manufactured on or after November 19, 2015 must reach 80.0 percent AFUE.
Non-weatherized gas furnaces manufactured on or after December 18, 2028 must reach 95.0 percent AFUE, up from the 80.0 percent minimum that applies to units manufactured before that date.
Severe Weather Events in Brookings County
Extreme weather puts real strain on furnace systems, forcing equipment to run harder and longer than it was sized to handle. How much stress a furnace absorbs is a local question, and the record for Brookings County shows what contractors here are working against.
152 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.