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Sizing a furnace for this county starts with understanding what the burner is actually asked to carry. Homes in Washington County, KS run heat about seven months a year, from October through April. A heat exchanger cycling that consistently accumulates fatigue at the joints and seams where combustion gases meet metal, and an ignition system that fires and rests on that schedule degrades faster when the original install left clearances tight or airflow unbalanced. A contractor quoting a replacement here factors load duration into equipment selection, because a unit that runs borderline undersized has nowhere to hide across a season that long.

Ductwork laid out for a furnace that no longer exists shapes what a new installation can actually do. Half the homes in Washington County, Kansas were built in 1953 or earlier (2020-2024 ACS 5-year). That generation of housing was ducted for something other than what a contractor brings to the job today, which means the trunk lines, the branch runs, and where the returns sit were all sized around different assumptions. A contractor quoting a furnace replacement here is pricing whether that existing distribution will carry the new unit, and the answer changes the job more than the equipment selection does.
What Gets Installed With a New Furnace

The furnace itself sits in the basement, utility room, or closet and is the heart of what a contractor puts in. A heat exchanger inside the cabinet warms the air that moves through your home, and a blower motor pushes that air out. The burner assembly, igniter, and control board all live inside the same cabinet.
The flue pipe runs from the furnace up and out of the house to carry combustion gases away. A new thermostat mounts on a wall in the living space and tells the system when to fire. The contractor also ties the furnace to the existing supply and return air openings and connects a gas line at the unit.
The drawing shows a representative layout, and a licensed contractor determines exactly what applies to your house.
Get matched in Washington CountyWashington County, Kansas, by the numbers
145 severe weather events were recorded in Washington County, Kansas 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 Washington County, Kansas were built in 1953 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesWashington County, Kansas holds 2,714 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 78.5% of the occupied homes in Washington County, Kansas (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Furnace Installation in Washington County, Kansas4 sourced rules & standards
What the Installation 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.
Severe Weather History in Washington County
Kansas weather puts real demands on heating equipment, and Washington County's conditions are part of what determines how hard a furnace has to work over its lifetime. What gets installed here should be sized and specified for here.
145 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.
