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A contractor quoting a furnace installation in Union County starts by sizing the system to what this house actually needs, not to a catalog default. 96 severe weather events were recorded in Union County, Iowa between 2015 and 2024. At roughly the midpoint of county records nationwide, severe weather here is a recurring part of operating life rather than an outlier, but it is not so relentless that it overrides the fundamentals. What decides whether a new furnace holds up over the years is how well the original install was done: ductwork sealed correctly, combustion air supplied properly, the unit matched to the square footage. Weather sets the backdrop; workmanship sets the outcome.
Ductwork laid down for an older furnace carries assumptions about airflow, static pressure, and trunk sizing that a modern unit does not share. Half the homes in Union County, Iowa were built in 1962 or earlier (2020-2024 ACS 5-year). A contractor quoting a furnace replacement in stock like this spends real time on the existing duct system, checking whether it can move the air the new equipment expects or whether sections have to be reworked before the unit goes in. The electrical service gets the same look, since load requirements have shifted. The furnace itself is straightforward to specify once those two questions are answered.
What Gets Installed With a New Furnace
The furnace itself sits in a mechanical room, basement, or utility closet and is the unit a homeowner sees most clearly. A contractor mounts the heat exchanger and burner assembly inside it, along with the blower that pushes conditioned air out into the house. The flue pipe runs from the furnace up and out of the building to carry combustion gases away.
The air handler components connect to the supply and return sides of the duct system at the furnace cabinet. A contractor also installs the thermostat on an interior wall, where it reads the air temperature and tells the furnace when to fire. The condensate drain and gas line connections are made at the unit itself, completing the hookup.
The drawing shows a representative layout, and a licensed contractor determines exactly what applies to this house.
Get matched in Union CountyUnion County, Iowa, by the numbers
96 severe weather events were recorded in Union 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 Union County, Iowa were built in 1962 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesUnion County, Iowa holds 5,785 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 72.1% of the occupied homes in Union County, Iowa (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Union County, Iowa5 codes & standards
What the installation 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.
Licenses and Rules for HVAC Work in Union 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 Union County
Extreme weather puts real demands on heating equipment, shortening service life and driving up the work a furnace has to do year after year. How hard that load runs in Union County shapes what kind of installation makes sense here.
96 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.