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A furnace repair in Union County starts with the burner assembly and heat exchanger, because those are the parts that have been cycling hardest. Homes in Union County, SD run heat about eight months a year, from October through May. That kind of sustained demand cracks heat exchangers, wears out ignitors, and stresses the burner itself in ways that show up as repeated breakdowns rather than a single clean failure. A contractor who skips a full inspection of those components and replaces only the part that triggered the call will likely be back.
Furnace systems cycle through generations faster than houses do, and when a contractor opens a unit in older Union County stock, what they find inside often belongs to a product line that manufacturers stopped supporting some years back. Half the homes in Union County, South Dakota were built in 1993 or earlier (2020-2024 ACS 5-year). A heat exchanger or control board from that era can still fail, and when it does, the parts search goes beyond the usual supplier catalogs. That is the job a repair call here regularly turns into: a working diagnosis followed by a parts availability question that changes what the contractor can recommend and what it costs to finish.
The Parts of a Furnace a Contractor Checks First
The furnace cabinet sits in the basement, utility room, or closet and is the core of the system. Inside it, the heat exchanger is the piece a contractor goes to early when something is wrong, because a crack there means combustion gases can reach living spaces. The burners, which sit directly beneath it, are another common source of trouble when the furnace runs poorly or not at all.
The blower motor and its fan wheel sit at the base of the cabinet and push conditioned air out through the supply side of the duct system. Alongside that, the control board, the igniter, the flame sensor, and the limit switches are all parts a contractor reads for fault codes or tests individually to trace why the furnace is short-cycling, failing to light, or shutting down early.
The drawing shows a typical furnace layout, and a licensed contractor determines which components apply and what work is needed in your specific home.
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 Furnace and HVAC Repair in Union County, South Dakota4 sourced rules and standards
What HVAC Repair Looks Like in Union County
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 Union County
Extreme weather puts stress on furnace components that steady, mild conditions never would. How often that stress lands on equipment in Union County shapes what repair work here actually looks like.
118 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.