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Sizing a furnace for this area takes the actual heating load seriously, not as a formality. Homes in Clark County, MO run heat about eight months a year, from October through May. The burner and heat exchanger cycle through that run with no long off-season to mask an undersized unit or a duct layout that makes the blower work harder than it should. A contractor quoting a replacement here has to establish the correct output for the house before anything else, because an install that cuts corners on that calculation puts the wrong equipment into a long, unforgiving season.
Ductwork laid down for an earlier generation of equipment is the first thing a contractor has to account for on a furnace installation here. Half the homes in Clark County, Missouri were built in 1970 or earlier (2020-2024 ACS 5-year). That puts a large share of the county's homes in a position where the ducts were sized and routed around something that no longer runs in them. Whether the existing network can carry the output and airflow a current furnace delivers is what gets measured before anything else is priced. Electrical service is the second check, since panels in houses of this vintage were not drawn up for modern load requirements.
What Gets Installed With a New Furnace
The furnace itself sits in the basement, utility room, or closet and is the box that produces heated air. A burner assembly inside it fires when the thermostat calls for heat, and a heat exchanger transfers that heat to the air moving through. The blower motor, housed within the same cabinet, pushes that warmed air out toward the rest of the house.
The flue pipe exits the top or back of the furnace and carries combustion gases out through the wall or roof. Alongside the furnace sits the air handler or evaporator coil if the home also runs central cooling, and the two share the same cabinet and blower. The thermostat mounts on an interior wall and is the control point that tells the whole system when to run.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your house and its existing setup.
Get matched in Clark CountyClark County, Missouri, by the numbers
89 severe weather events were recorded in Clark County, Missouri 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, Missouri were built in 1970 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesClark County, Missouri holds 3,233 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 78.3% of the occupied homes in Clark County, Missouri (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Clark County, Missouri4 codes, standards, and statutes
What the installation actually 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.
Severe Weather Events in Clark County
Weather in Clark County puts real demands on heating equipment, and those demands compound over time. What a furnace endures shapes how it should be sized, installed, and specified for this area.
89 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.