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On a furnace repair call here, a contractor moves straight to the burner assembly and ignition system before checking anything else. Homes in Caldwell County, MO run heat about seven months a year, from October through April. That kind of sustained cycling puts wear on the parts that light the burner and keep it running through each cycle, and those are the components most likely to show fatigue by the time a homeowner notices a problem. Cracks in the heat exchanger also accumulate over years of that workload, and a contractor inspecting one here has good reason to look carefully rather than assume the unit is fine because it ran last winter.
Furnace parts for systems running in older housing stock can be genuinely hard to source, and in Caldwell County the age of the stock makes that a real variable on repair calls. Half the homes in Caldwell County, Missouri were built in 1974 or earlier (2020-2024 ACS 5-year). A system that has been running in a house since the building was new may take components that manufacturers stopped producing years ago, which changes what a contractor can price and what they can promise. That is the detail a repair call here turns on: not whether the unit runs, but whether the part it needs still exists on a shelf somewhere.
The Parts of a Furnace a Contractor Checks First
The furnace itself sits in the basement, utility closet, or garage and is the unit a contractor opens first. Inside it, the heat exchanger is the piece most worth understanding: a crack there lets combustion gases into your living air, so it gets close attention. The burners, which fire inside the heat exchanger, are checked for dirt, misalignment, and uneven flame.
The blower motor pushes conditioned air out through your registers and sits at the base of the furnace cabinet. The flue pipe runs from the top of the unit to an exterior wall or chimney and carries exhaust gases out of the house. The igniter and flame sensor work as a pair near the burners, and either one failing is enough to keep the furnace from lighting at all.
The drawing shows a typical furnace layout, and a licensed contractor determines which components apply to the specific equipment and setup in your home.
Get matched in Caldwell CountyCaldwell County, by the numbers
38 severe weather events were recorded in Caldwell 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 Caldwell County, Missouri were built in 1974 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCaldwell County, Missouri holds 4,275 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 78.2% of the occupied homes in Caldwell County, Missouri (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Repair Rules & Standards for Caldwell County, Missouri4 sourced regulations and codes
What Furnace Repair Looks Like in Caldwell 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.
Severe Weather Events in Caldwell County
Weather in this part of Missouri puts real load on heating equipment. How hard a furnace works over its life is partly a local question, and storm history is one way to see what the climate here asks of it.
38 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.