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A furnace in Ste. Genevieve County earns its wear on the burner, the heat exchanger, and the ignition system. Homes in Ste. Genevieve County, MO run heat about seven months a year, from October through April. Every cycle through that season stresses the heat exchanger through expansion and contraction, and the ignition components fire repeatedly from October through April before sitting idle through summer. By the time a fault shows up, the burner assembly and the heat exchanger have accumulated the most run time in the system. A contractor starting a repair here checks those components first, because that is where the load has landed.
Furnaces in houses of this vintage tend to fail in specific ways: the heat exchanger develops stress cracks, the flue collar corrodes, and the burner assembly accumulates a kind of buildup that belongs to long service under real winters. Half the homes in Ste. Genevieve County, Missouri were built in 1981 or earlier (2020-2024 ACS 5-year). A contractor opening a furnace in stock like this is looking at metal fatigue and combustion residue, not a tripped sensor on a two-year-old board. The parts that fail here are mechanical, and whether they are still manufactured matters as much as the diagnosis itself.
The Parts of a Furnace a Contractor Checks First
The furnace itself sits in a mechanical room, basement, or utility closet and is the piece a contractor goes to first. Inside it, the heat exchanger is the part that fails most quietly and matters most when it does, because cracks there let combustion gases move where they should not. The burners sit just below it and are the first stop when the unit runs but produces no heat.
The blower motor and its fan wheel sit at the base of the furnace cabinet and push conditioned air out through the supply side of the duct system. Beside it, the control board reads signals from the thermostat and tells every other part when to run. The flue pipe runs from the top of the cabinet up and out of the house, and a contractor checks it whenever combustion problems are on the table.
The drawing shows a typical furnace layout, and a licensed contractor determines which parts apply to your specific system and what work they actually need.
Get matched in Ste. Genevieve CountySte. Genevieve County by the Numbers
43 severe weather events were recorded in Ste. Genevieve 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 Ste. Genevieve County, Missouri were built in 1981 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSte. Genevieve County, Missouri holds 8,326 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 83.0% of the occupied homes in Ste. Genevieve County, Missouri (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Behind Furnace Repair in Ste. Genevieve County, Missouri4 sourced rules and standards
What Happens When a Contractor Comes Out
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 Ste. Genevieve County
Extreme weather puts real stress on furnace equipment, cycling it harder and more often than calm seasons ever would. How much of that load falls on homes in this county is a local question, and it shapes what repair work looks like here.
43 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.