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Sizing a furnace for this county is not a decision a contractor can make from catalog specs alone. Homes in Codington County, SD run heat about nine months a year, from September through May. The burner and ignition system cycle through most of the calendar year, and undersized or poorly fitted equipment accumulates wear on those parts faster than the idle months can offset. A contractor quoting a new install has to run the load calculation against what this house actually demands across a long heating season, because a unit that holds up in a mild-use market will show its limits here on the heat exchanger long before the warranty runs out.
Ductwork sized and routed for equipment that no longer exists is what a contractor runs into in a large share of Codington County homes. Half the homes in Codington County, South Dakota were built in 1978 or earlier (2020-2024 ACS 5-year). That gap between the building and what is now expected to run in it means the duct layout gets measured and assessed before anything else on an installation job. If the existing runs cannot carry the airflow a new furnace requires, the contractor is pricing trunk modifications alongside the unit itself.
What Gets Installed With a New Furnace
The furnace itself sits in a utility space, basement, or closet and is the core unit a contractor installs. Attached to it is the air handler, which moves conditioned air through the home. Together these two pieces form the heart of what a homeowner is buying.
The thermostat mounts on a main-floor wall and gives the homeowner control over the whole system. A contractor also installs the flue or venting pipe, which runs from the furnace to an exterior wall or the roof to carry combustion gases out of the house.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your home and its existing setup.
Find a contractor in Codington CountyCodington County, by the numbers
167 severe weather events were recorded in Codington County, South Dakota 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 Codington County, South Dakota were built in 1978 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodington County, South Dakota holds 13,533 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 69.8% of the occupied homes in Codington County, South Dakota (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules on the Books for Codington County, South Dakota4 codes, standards & statutes
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 Codington County
Codington County weather puts real load on heating equipment. A furnace sized and installed for local conditions holds up better than one spec'd for somewhere milder.
167 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.