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A contractor quoting a furnace installation in Clark County has to size the system around the actual heating load of the house, not around a dramatic weather history that does not exist here. 40 severe weather events were recorded in Clark County, Illinois between 2015 and 2024. At that rate, severe weather touches this area infrequently enough that it does not set the terms of an install. Duct layout, equipment capacity relative to the structure, and the tightness of the work are what determine whether a new furnace heats the house evenly and runs efficiently for years.
Ductwork sized and routed for a different era of equipment shapes whether a furnace installation is straightforward or complicated. Half the homes in Clark County, Illinois were built in 1971 or earlier (2020-2024 ACS 5-year). A house built that long before modern furnace design was built around different airflow expectations, and the existing trunk lines and branch runs reflect that. A contractor installing a new furnace here reads the duct layout before anything else, checking whether it can carry the volumes and static pressures the new unit demands. Where it cannot, the ductwork becomes part of the job.
What Gets Installed With a New Furnace
The furnace itself sits in the basement, utility room, or mechanical closet and is the core of what a contractor installs. Inside it, the heat exchanger and burner assembly do the work of producing heat, while the blower motor pushes conditioned air into the supply side of your home's duct system.
The flue pipe runs from the furnace to an exterior wall or up through the roof, carrying combustion gases out of the house. Alongside it, the contractor installs or connects the gas line, the condensate drain on high-efficiency units, and the thermostat wiring that ties the new equipment to the controls in your living space.
The drawing shows the general layout of these components, and a licensed contractor determines exactly what applies to your house and its existing setup.
Get matched in Clark CountyClark County, Illinois, by the numbers
40 severe weather events were recorded in Clark County, Illinois 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, Illinois were built in 1971 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesClark County, Illinois holds 7,307 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 80.3% of the occupied homes in Clark County, Illinois (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Furnace Installation in Clark County, Illinois5 sourced rules and standards
What the Job Looks Like in Clark 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.
Licensing and Legal Requirements in Clark County, Illinois
Illinois leaves HVAC licensing to the municipality: state law lets the corporate authorities of each city or village examine, license and regulate heating, air conditioning and refrigeration contractors, and caps the licence fee they may charge at $50 — so who licenses you depends on the town you work in.
Severe Weather Events in Clark County
Local weather puts real load on heating equipment, and how hard a furnace works over its life depends largely on what the climate demands of it. That makes the storm record for this area relevant to any conversation about installation.
40 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.