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A furnace install in Story County is a local engineering decision, not a product selection. 234 severe weather events were recorded in Story County, Iowa between 2015 and 2024. At that rate, severe weather is a standing condition here, and a contractor sizing a new furnace has to account for what the climate actually asks of the equipment rather than defaulting to regional rule-of-thumb figures. Duct sealing, equipment placement, and combustion air all get evaluated against what this area runs through each year.
Ductwork laid down for an older furnace was sized for the heat output and airflow of that furnace. Half the homes in Story County, Iowa were built in 1984 or earlier (2020-2024 ACS 5-year). A new unit draws on that same trunk-and-branch layout, and if the runs are undersized, restricted, or leaking at the joints, the new furnace underperforms regardless of its rated output. A contractor quoting a furnace replacement in Story County opens the existing duct system and checks it against what the new unit requires before the equipment selection is final.
What Gets Installed With a New Furnace
The furnace itself sits in the basement, utility room, or crawl space and is the unit a homeowner buying this system is paying for at its core. A contractor mounts the air handler or blower assembly inside or directly beside it, drawing air through the system and pushing conditioned air out through the supply side.
The flue or vent pipe runs from the furnace up and out of the house, carrying combustion gases away. The thermostat mounts on a main-floor wall and is the control point a homeowner will interact with daily. A contractor also installs or ties into the condensate drain line where the equipment requires one.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to this house.
Get matched in Story CountyStory County, Iowa, by the numbers
234 severe weather events were recorded in Story County, Iowa 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 Story County, Iowa were built in 1984 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesStory County, Iowa holds 41,887 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 55.5% of the occupied homes in Story County, Iowa (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Story County, Iowa5 codes and standards
What the Install 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.
Licensing and Legal Requirements in Story County, Iowa
Iowa requires a state licence to install or repair HVAC, refrigeration, mechanical or plumbing systems, and to operate as a contractor, with exceptions listed in section 105.11.
Severe Weather Events in Story County
Local weather puts real load on heating equipment, and how hard a furnace works over its life is a local fact, not a national average. What Story County sees shapes what a properly sized, properly installed furnace here needs to handle.
234 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.