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A contractor quoting a furnace installation in Clark County has to get the sizing right before anything else, because the load this area puts on heating equipment is not light. 143 severe weather events were recorded in Clark County, Wisconsin between 2015 and 2024. At that rate, severe weather is a standing condition, and a furnace sized for a milder place will run short of capacity when the county needs it most. The unit on the truck is less important than the math done before it arrives.
Ductwork laid down for the original heating system in a house this old was sized around a different unit, with different airflow demands, and often a different fuel. Half the homes in Clark County, Wisconsin were built in 1972 or earlier (2020-2024 ACS 5-year). That means a contractor coming in to install a new furnace has to work out whether what is already in the walls and ceilings will carry it, before the new equipment matters at all. Trunks that are undersized, returns that were never adequate, or runs that were modified over the decades can all force changes that sit outside the furnace quote entirely.
What Gets Installed With a New Furnace
The furnace itself sits in a mechanical room, basement, or utility closet and is the unit a homeowner is most likely to recognize on sight. It houses the heat exchanger, the burner assembly, and the blower motor, all of which a contractor installs as a single cabinet bolted into place and connected to the fuel supply.
The flue pipe runs from the furnace cabinet up and out of the house, carrying combustion exhaust away. Alongside it, a contractor installs the thermostat on an interior wall, which is the control point the household uses every day, and a filter housing or media cabinet where the return air enters the system.
The drawing shows a typical layout, and a licensed contractor determines what applies to this particular house.
Get matched in Clark CountyClark County, Wisconsin, by the numbers
143 severe weather events were recorded in Clark 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 Clark County, Wisconsin were built in 1972 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesClark County, Wisconsin holds 14,961 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 78.5% of the occupied homes in Clark County, Wisconsin (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Clark County, Wisconsin6 codes, standards, and laws
What the Installation 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 Clark 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 in Clark County
Clark County winters put real load on heating equipment, and that load compounds when storms hit. A furnace sized and installed for local conditions holds up where a generic setup falls short.
143 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.