Tell us about the job
Takes about a minute. No obligation.
Sizing a furnace for this county starts with one fixed fact about the climate. Homes in Clackamas County, OR run heat about ten months a year, from September through June. The burner and heat exchanger are cycling through nearly the full calendar, and every cycle is stress on the ignition system, the heat exchanger seams, and the blower motor. A contractor who skips a proper load calculation and installs by rule of thumb leaves the equipment working harder than it needs to, and the extra strain shows up in the components that cycle most. Getting the equipment matched to the actual load of this house is what determines how long those parts last.
Existing ductwork is what decides how a furnace installation goes in much of this county. Half the homes in Clackamas County, Oregon were built in 1985 or earlier (2020-2024 ACS 5-year). Ductwork laid out for an older system carries different dimensions, different routing logic, and different static pressure assumptions than what a modern furnace needs. A contractor quoting the job has to assess what is already in the walls before the equipment selection means anything, because a furnace sized correctly for the house can still perform badly if the distribution system behind it cannot move the air. Electrical service gets the same look.
What Gets Installed With a New Furnace
The furnace itself sits in a utility space, basement, or closet and is the unit that generates heat. A burner assembly inside it ignites the fuel, a heat exchanger transfers that heat to the air moving through, and a blower fan pushes the warmed air into the duct system serving the rest of the house.
The flue pipe runs from the furnace to an exterior wall or roofline and carries combustion gases out of the home. Alongside it, a contractor installs the gas line connection, the thermostat on a main living-area wall, and any filtration or air-handling components that tie into the return side of the system.
The drawing shows a general layout of these components, and a licensed contractor determines exactly what applies to this house.
Get matched in Clackamas CountyClackamas County, by the record
13 severe weather events were recorded in Clackamas 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 Clackamas County, Oregon were built in 1985 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesClackamas County, Oregon holds 174,323 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 70.7% of the occupied homes in Clackamas County, Oregon (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules & Standards for Clackamas County, Oregon6 sourced regulations and codes
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.
Licensing and Legal Requirements in Clackamas 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.