
What Missouri homes are up against.
NOAA National Centers for Environmental Information, Storm Events Database, bulk CSV export, events 2015-01-01 through 2024-12-31. · U.S. Census Bureau, 2020-2024 American Community Survey 5-Year Estimates
A homeowner deciding whether a furnace can wait is really asking how much rest it gets the rest of the year. Homes in Missouri run heat about seven months a year, from October through April. That leaves the burner and heat exchanger cycling on and off across most of the calendar, with only a short stretch when the system sits idle. A cracked heat exchanger or a weak igniter tends to show itself gradually, on a later start rather than the first one of the week, so a furnace that struggled once is already telling a contractor something worth checking before the next call for heat.
Before a contractor can quote a new furnace or condenser, someone has to open the wall or the attic and look. Half the homes in Missouri were built in 1978 or earlier (2020-2024 ACS 5-year). That matters because the ducts, the wiring, and the vents already running through a house were sized for equipment that worked differently than what's installed now. A load calculation done from the outside, or from a listing photo, tells a contractor almost nothing. What the return duct actually measures, what the panel can carry, whether the vent still matches the appliance it serves, all of that gets checked in person, in the house, before a number goes on paper.
Does Missouri weather put extra strain on your HVAC system?
2015–2024 · Source: NOAA National Centers for Environmental Information, Storm Events Database.
A county with a heavier storm record puts more demand on the equipment sitting outside your home. Wind can rock a condenser on its pad, hail can dent the cabinet and bend the fins that move heat, and heavy rain can flood a unit set too low to the ground. Have a contractor check where your outdoor unit sits, how firmly it is anchored, and the condition of the cabinet and coil.