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Sizing a furnace for Andrew County means sizing it for a long stretch of continuous demand on the burner, the heat exchanger, and the ignition system. Homes in Andrew County, MO run heat about seven months a year, from October through April. A unit that is undersized cycles harder and more often through those months, and the heat exchanger takes the punishment first. A contractor running a load calculation here is not working from a generic table; the local heating load, the house envelope, and the ductwork already in the building all determine what capacity is actually required. Install the wrong size and the system's weakest components reach failure ahead of schedule.
Ductwork laid for a furnace that has since been replaced at least once, and possibly twice, rarely carries a new system without adjustment. Half the homes in Andrew County, Missouri were built in 1980 or earlier (2020-2024 ACS 5-year). That history means the duct runs a contractor finds behind the walls here were sized for something other than what is going in, and the electrical service may carry a different load than a modern furnace draws. Getting the installation right depends on what those existing conditions actually are, not on what the permit year suggests.
What Gets Installed With a New Furnace
The furnace itself sits in a utility room, basement, or closet at the center of the system. It holds the burner assembly, the heat exchanger, and the blower motor. The burner produces heat, the exchanger separates combustion gases from the air moving through your home, and the blower pushes that warmed air out through the supply side.
The flue pipe runs from the furnace to an exterior wall or up through the roof, carrying combustion gases out of the house. Alongside the furnace, the contractor installs the air handler components if they are not built into the unit itself, and connects the thermostat, which mounts on an interior wall and tells the furnace when to fire and when to stop.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your house and its existing setup.
Get matched in Andrew CountyAndrew County, by the numbers
46 severe weather events were recorded in Andrew 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 Andrew County, Missouri were built in 1980 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesAndrew County, Missouri holds 7,558 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 76.7% of the occupied homes in Andrew County, Missouri (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules on the Books for Andrew County, Missouri4 codes & standards
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 Andrew County
Weather in Andrew County puts real demands on heating equipment, from hard freezes that push furnaces to their limits to the kind of swings that age components faster than moderate climates do. What the local record looks like shapes what a contractor specifies when sizing and installing equipment here.
46 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.