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A contractor quoting furnace installation in Dewey County has to get the sizing right from the start. Homes in Dewey County, SD run heat about nine months a year, from September through May. The burner, heat exchanger, and ignition system cycle repeatedly across that run, and a unit that is undersized for the house works harder on every cold morning than one matched correctly to the load. Stress on those components accumulates. A poor installation has nowhere to hide when the system barely rests.
Ductwork laid down for a furnace that left the house a generation ago does not automatically carry the one going in now. Flow rates change, and a run that was adequate for older equipment can choke a modern unit or leave rooms cold. Half the homes in Dewey County, South Dakota were built in 1978 or earlier (2020-2024 ACS 5-year). A contractor fitting a new furnace here checks the existing duct network against what the replacement unit actually demands, and where the runs fall short, that is where the real work is.
What Gets Installed With a New Furnace
The furnace itself sits inside the home, most often in a basement, utility room, or closet. It is the unit that generates heat, pulling in air, warming it, and pushing it back out through the supply side of the duct system. A flue pipe runs from the furnace to the exterior of the house to carry combustion gases out.
The thermostat mounts on an interior wall and is the control point the homeowner uses every day. Alongside it, a contractor installs the air handler or blower components that move conditioned air through the house, and where a whole-system setup is involved, a matching air conditioner or heat pump coil sits paired with the furnace in the same air path.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to this house and its existing setup.
Find a contractor in Dewey CountyDewey County by the Numbers
212 severe weather events were recorded in Dewey 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 Dewey 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 EstimatesDewey County, South Dakota holds 1,931 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 61.2% of the occupied homes in Dewey County, South Dakota (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards for Furnace Installation in Dewey County, South Dakota4 sourced rules and 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.
Severe Weather History in Dewey County
Heating equipment in South Dakota works against conditions that vary sharply by location and year. How hard a furnace has to work, and how often, is a local question, and the weather record for this county is part of that answer.
212 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.