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Sizing a furnace for this house requires a contractor to work out exactly how hard the burner will be asked to cycle, and the answer here is: hard, and for a long time. Homes in Douglas County, KS run heat about seven months a year, from October through April. The heat exchanger, the ignition system, and the burner itself carry nearly all of that load, and a unit that is even slightly undersized runs longer cycles to compensate, which shortens the life of those parts before anything else shows wear. A contractor quoting a new furnace here needs to get the load calculation right before the equipment conversation starts.
Ductwork laid in for equipment generations removed from what a contractor installs today is the part of a furnace job in Douglas County that drives the scope. Half the homes in Douglas County, Kansas were built in 1988 or earlier (2020-2024 ACS 5-year). That share of the housing stock was built around heating systems with different airflow demands, and the duct trunk sizes that served those systems often restrict what a high-efficiency furnace needs to move. A contractor pulling permits here checks the existing duct geometry before settling on unit size, because a mismatch sends more air back to the furnace than the system was designed to handle.
What Gets Installed With a New Furnace
The furnace itself sits in a utility space, most often a basement, closet, or mechanical room. A burner inside it produces heat, and a heat exchanger transfers that warmth to the air moving through the system. The blower motor, housed in the same cabinet, pushes that conditioned air out into the home.
The flue pipe runs from the furnace to the outside, carrying combustion gases out of the house. Alongside the furnace, a contractor also installs a new thermostat on an interior wall, which is where the homeowner sets temperatures and the system takes its cues.
The drawing shows a general layout of these components, and a licensed contractor determines exactly how each one is configured for this house.
Get matched in Douglas CountyDouglas County, Kansas, by the numbers
208 severe weather events were recorded in Douglas 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 Douglas County, Kansas were built in 1988 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesDouglas County, Kansas holds 53,675 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 50.1% of the occupied homes in Douglas County, Kansas (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules That Apply in Douglas County, Kansas4 codes, standards & licensing rules
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 Events in Douglas County
Weather patterns in Douglas County put real load on heating equipment over time. A furnace sized and installed for local conditions holds up better than one spec'd for somewhere else.
208 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.