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Homes in Washington County, OR run heat about nine months a year, from October through June. The burner and heat exchanger cycle through most of that time, accumulating wear that shows up as cracked heat exchangers, degraded igniter assemblies, and flame sensors that no longer read cleanly. A contractor arriving at a repair call here starts with those parts, because they carry the load. The idle months matter too: a furnace that sits through a warm summer and then restarts cold can reveal a fault that went unnoticed at shutdown, and that fault is often what the homeowner calls about in October.
Furnace repair in this county runs into a specific wall more often than most people expect: the opened unit needs a part that the manufacturer stopped making years ago. Half the homes in Washington County, Oregon were built in 1990 or earlier (2020-2024 ACS 5-year). A house that age has likely had its original furnace swapped at least once, but the replacement still predates enough of the current catalog that a contractor pulling a heat exchanger or a control board has to search outside the standard order sheet. That changes the repair timeline and sometimes changes the repair decision entirely.
The Parts of a Furnace a Contractor Checks First
The furnace itself sits in a basement, utility room, or closet and is the piece a contractor opens first. Inside it, the heat exchanger is the part that fails silently and matters most: cracks there let combustion gases into living air. The burners, igniter, and flame sensor all sit inside that cabinet and are common starting points when a furnace stops lighting or cycles off too quickly.
The blower motor and its wheel sit at the base of the furnace and push conditioned air through the house. The flue pipe runs from the top of the furnace out through the wall or roof and handles exhaust. The filter housing sits at the air intake, and a clogged filter puts strain on the blower and everything downstream.
The drawing shows a typical furnace layout, and a licensed contractor will assess which components apply to the specific equipment and setup in your home.
Get matched in Washington CountyWashington County, Oregon, by the numbers
7 severe weather events were recorded in Washington 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 Washington County, Oregon were built in 1990 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesWashington County, Oregon holds 243,278 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 60.8% of the occupied homes in Washington County, Oregon (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Behind Furnace Repair in Washington County, Oregon6 sourced rules & standards
What happens when a contractor comes out
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 and Legal Requirements in Washington 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.