Tell us about the job
Takes about a minute. No obligation.
A furnace quoted and installed without a careful load calculation carries that error into every heating season it runs. Homes in Pettis County, MO run heat about seven months a year, from October through April. The burner, the heat exchanger, and the ignition system cycle hard through those months, then sit idle through the rest. An undersized or poorly sealed unit works harder than the load demands, and the heat exchanger takes the penalty first. A contractor sizing a replacement here has to account for that workload from day one, because a marginal install has nowhere to hide once the cold sets in.
Ductwork put in for one generation of equipment rarely carries the next without adjustment. Half the homes in Pettis County, Missouri were built in 1974 or earlier (2020-2024 ACS 5-year). That history shows up in the plenum sizes, the trunk line routing, and the way air moves through rooms on the far end of a run. A contractor installing a new furnace here reads those conditions before pricing the equipment, because what the ducts can and cannot handle shapes the scope of the job as much as anything on the equipment side does.
What Gets Installed With a New Furnace
The furnace itself sits in a utility space, basement, or closet near the center of the house. It holds the heat exchanger and the burner assembly, which is where the fuel combustion happens, along with the blower that pushes conditioned air out into the living space. A new installation also includes the flue pipe, which runs from the furnace to an exterior wall or the roof and carries combustion gases out of the home.
The air handler cabinet connects to the supply and return air paths of the home's duct system at the furnace. Alongside it sits the thermostat, mounted on an interior wall, which signals the furnace when to fire and when to stop. A contractor also installs a new filter housing if one is not already in place, positioning it where return air enters the system.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your house and how each piece gets positioned within it.
Get matched in Pettis CountyPettis County, by the numbers
94 severe weather events were recorded in Pettis 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 Pettis County, Missouri were built in 1974 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesPettis County, Missouri holds 18,673 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 69.1% of the occupied homes in Pettis County, Missouri (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Pettis County, Missouri4 codes and standards
What HVAC Installation Looks Like in Pettis 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 Pettis County
Weather conditions here put direct pressure on heating equipment: harder seasons mean more runtime, more stress, and faster wear on components that were sized for local conditions. That is why the climate record for this area belongs on a page about furnace installation.
94 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.