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Homes in Union County, OR run heat about ten months a year, from September through June. A furnace cycling through that kind of season puts its real load on the heat exchanger, the burner, and the ignition system. Those are the parts that fire, expand, cool, and contract on every call for heat, month after month. A contractor coming in on a repair call checks them first, because that is where failure concentrates. Cracks in a heat exchanger or a degraded ignitor do not show up on the outside of the unit.
Ductwork running through a house this old was sized and routed for equipment that has long since been replaced, and what a contractor finds behind the registers shapes the repair as much as what is wrong with the furnace itself. Half the homes in Union County, Oregon were built in 1973 or earlier (2020-2024 ACS 5-year). That depth of age means heat exchangers, blower wheels, and burner assemblies on systems currently in these houses have been working against ducts that were never configured for them. When a contractor opens the unit, the condition of internal components reflects that sustained mismatch, and parts for furnaces running in stock like this are not always in ready supply.
The Parts of a Furnace a Contractor Checks First
The furnace itself sits in a mechanical room, basement, or utility closet and is the piece a contractor reaches first. Inside it, the heat exchanger is the part most worth understanding: it separates combustion gases from the air your household breathes, and a crack or breach there is serious. The burners, the igniter, and the flame sensor all live in the same cabinet and are common failure points when a furnace stops lighting or won't stay on.
The blower motor sits at the base of the furnace cabinet and pushes conditioned air into the supply side of the duct system. The flue pipe runs from the furnace to an exterior wall or up through the roof and carries combustion exhaust out of the house. The thermostat on the wall is the control side of the system, and a wiring or calibration fault there can mimic a furnace problem that is really no furnace problem at all.
The drawing shows the general layout of a furnace system, and a licensed contractor determines which components apply and what condition they are in for your specific home.
Get matched in Union CountyUnion County, Oregon, by the numbers
150 severe weather events were recorded in Union 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 Union County, Oregon were built in 1973 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesUnion County, Oregon holds 11,829 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 65.5% of the occupied homes in Union County, Oregon (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Furnace and HVAC Repair in Union County, Oregon6 sourced rules and standards
What happens when a contractor comes out to your home
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 Union 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 Union County by Year
Hard weather puts hours on a furnace fast, cycling it harder and longer than mild seasons ever would. How much of that load falls on equipment in Union County shapes what repairs look like here and how often they come due.
150 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.