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A contractor diagnosing a furnace in Iowa County works through the routine causes first: heat exchanger fatigue, a worn igniter, a blower motor that has been cycling for years without a service call. 90 severe weather events were recorded in Iowa County, Wisconsin between 2015 and 2024. At that rate, severe weather is real but not relentless, and a contractor here cannot point to storm load as the default explanation when a furnace gives out. What they find inside the cabinet usually points somewhere else, toward deferred maintenance or parts that simply reached the end of their service life.
Ductwork in a house this old has usually been touched more than once. Fittings cut for one system, patched for the next, and adapted again. Half the homes in Iowa County, Wisconsin were built in 1975 or earlier (2020-2024 ACS 5-year). That history matters most when a furnace is opened and a contractor identifies what the unit actually takes to run correctly. Parts for systems installed in housing of this vintage can fall outside current production runs, which changes both the repair timeline and what a contractor prices before committing to a fix. A replacement part that is still manufactured gets the job done quickly. One that is not sends the repair in a different direction entirely.
The Parts of a Furnace a Contractor Checks First
The furnace itself sits in the basement, utility room, or crawl space and is the piece a contractor goes to first. Inside it, the heat exchanger is the part most worth understanding: cracks or corrosion there affect both heating performance and safety. The burner assembly, which ignites the fuel and feeds the heat exchanger, is another early stop.
The blower motor sits inside the furnace cabinet and pushes conditioned air out through the house. Near it, the flue or exhaust vent carries combustion gases out of the building, and the control board governs the sequence that tells each component when to run. Problems with any of these can look similar from the outside, which is why a contractor works through them methodically.
The drawing shows a representative layout, and a licensed contractor determines which components apply and what each one needs in your specific home.
Get matched in Iowa CountyIowa County, Wisconsin, by the numbers
90 severe weather events were recorded in Iowa 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 Iowa County, Wisconsin were built in 1975 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesIowa County, Wisconsin holds 11,108 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 77.4% of the occupied homes in Iowa County, Wisconsin (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Repair Rules on the Books for Iowa County, Wisconsin6 codes, standards & citations
What the repair visit looks like
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.
Licensing and Legal Requirements in Iowa 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 Iowa County
Harsh weather puts real strain on furnace systems, cycling them hard when conditions demand the most. How often that happens in Iowa County shapes how much wear local equipment takes and how quickly problems show up.
90 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.