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Sizing a furnace for Lane County starts with understanding what the burner and heat exchanger are actually asked to carry. Homes in Lane County, OR run heat about ten months a year, from September through June. A unit that is undersized for this house cycles harder and more often, and those cycling parts, the burner, the ignition system, the heat exchanger, accumulate wear against a long annual load rather than a short one. A contractor running a load calculation here has to account for the house envelope, the duct layout, and the full heating demand before settling on equipment capacity. A furnace that fits on paper but sits at the edge of its rated output will show stress in the heat exchanger long before a homeowner expects a replacement conversation.
Ductwork laid down for furnaces that no longer exist shapes what a contractor finds when they open the walls of a Lane County home today. Half the homes in Lane County, Oregon were built in 1977 or earlier (2020-2024 ACS 5-year). That ductwork may carry a new system well, or it may not, but a contractor cannot tell from the outside. They have to get in and measure what the existing runs can handle before a new unit is selected. The electrical is a similar question. What a house of that vintage was wired for and what a modern furnace draws are two numbers that have to match before the install can proceed.
What Gets Installed With a New Furnace
The furnace itself sits in a utility space, basement, or closet at the center of the house. That cabinet holds the burner, the heat exchanger, and the blower that pushes conditioned air into the ducts. A contractor sets the unit on a level surface with clearance on all sides for access and airflow.
The flue pipe runs from the furnace up through the wall or roof, carrying combustion gases out of the house. The thermostat mounts on an interior wall and is the control point for the whole system. A gas line and a condensate drain, where the equipment calls for one, connect at the unit itself.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your home.
Get matched in Lane CountyLane County, by the numbers
20 severe weather events were recorded in Lane 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 Lane County, Oregon were built in 1977 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesLane County, Oregon holds 169,788 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 59.7% of the occupied homes in Lane County, Oregon (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules & Standards for Lane County, Oregon6 sourced rules and standards
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 Rules for HVAC Work in Lane 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.