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A contractor quoting a furnace installation here has to treat sizing as a local question, not a catalog lookup. Homes in Deschutes County, OR run heat about ten months a year, from September through June. The burner, the heat exchanger, and the ignition system are cycling from early fall through late spring, and a unit that is undersized by even a modest margin runs longer cycles to meet setpoint, wearing those components faster. Sloppy duct sealing compounds it: the furnace works harder to push conditioned air where it belongs. A properly sized unit with tight ductwork distributes that load the way the equipment was designed to carry it.
Ductwork routed for an older furnace carries assumptions about static pressure, return paths, and branch sizing that a new unit may expose immediately. Half the homes in Deschutes County, Oregon were built in 1998 or earlier (2020-2024 ACS 5-year). A contractor quoting a furnace replacement here has to look at what the existing duct system was built to do before settling on equipment, because a unit that outpaces the ducting will run short cycles and heat the house unevenly regardless of its rated output. The electrical side is simpler to bring into line. The ductwork takes more judgment.
What Gets Installed With a New Furnace
The furnace itself sits in a utility room, basement, or closet and is the unit that generates heat for the house. A burner assembly inside it produces heat, and a heat exchanger transfers that heat to the air moving through the system. A blower motor then pushes that warmed air out through the supply side.
The flue pipe runs from the furnace to an exterior wall or through the roof, carrying combustion gases out of the house. Alongside the furnace, a new thermostat goes on an interior wall and gives the homeowner control over when the system runs and at what setpoint.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to this house.
Get matched in Deschutes CountyDeschutes County by the numbers
135 severe weather events were recorded in Deschutes County, Oregon 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 Deschutes County, Oregon were built in 1998 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesDeschutes County, Oregon holds 99,297 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 70.0% of the occupied homes in Deschutes County, Oregon (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Deschutes County, Oregon6 sourced standards and codes
What the installation looks like from your end
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.
Licensing Rules for HVAC Work in Deschutes County, Oregon
Oregon’s contractor licence does not reach casual, minor or inconsequential work on one structure where the person’s contracts total less than $1,000 — and the exemption is unavailable to anyone who advertises or signs themselves as a contractor, at any price.
Oregon requires a current Construction Contractors Board licence, with the right endorsement, to undertake, offer to undertake or bid construction work.
Severe Weather Events in Deschutes County
Deschutes County weather puts real demands on heating equipment, and those demands shape what a furnace needs to handle over its working life. How hard a system runs, and how reliably it needs to perform, is a local question.
135 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.