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Sizing a furnace for this house means accounting for a burner and heat exchanger that cycle through a long, continuous run each year. Homes in Cass County, MO run heat about seven months a year, from October through April. A contractor working up a load calculation here has to get the unit capacity right before anything else, because an undersized system runs its ignition components hard and its heat exchanger harder, and the cumulative wear shows up sooner than it would with less annual runtime. A sloppy install has nowhere to hide.
Ductwork laid out for an earlier generation of equipment does not automatically carry a modern furnace at the volumes and static pressure the new unit expects. Half the homes in Cass County, Missouri were built in 1992 or earlier (2020-2024 ACS 5-year). A contractor quoting a furnace installation has to assess what those existing runs can actually handle before the equipment choice matters much. If the duct layout is too restrictive, the install price changes, and sometimes the routing does too.
What Gets Installed With a New Furnace
The furnace itself sits in the basement, utility room, or crawl space and is the piece doing the central work: burning fuel to produce heat that moves through the house. Attached to it is the heat exchanger, a metal chamber where combustion gases stay separated from the air your family breathes, and the blower, a fan assembly that pushes conditioned air out into the supply side of your duct system.
The flue pipe runs from the furnace up and out of the house, carrying exhaust gases away from the living space. Alongside the furnace, a contractor also installs the thermostat, which mounts on an interior wall and tells the system when to fire and when to stop, and the filter housing, which sits at the air intake and holds the filter that screens the return air before it reaches the heat exchanger.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your home and its existing setup.
Get matched in Cass CountyCass County by the Numbers
178 severe weather events were recorded in Cass 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 Cass County, Missouri were built in 1992 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCass County, Missouri holds 45,834 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 75.6% of the occupied homes in Cass County, Missouri (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Cass County, Missouri4 codes & standards
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.
Severe Weather Events in Cass County
Cass County weather puts real load on heating equipment. How hard a furnace works over its life is a local question, and the record below is part of the answer.
178 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.