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Sizing a furnace for this house is not a step a contractor guesses at. Homes in Kitsap County, WA run heat about ten months a year, from September through June. A burner and heat exchanger cycling through that kind of run accumulate wear on a schedule set by how well the original install matched the actual load. A unit that is undersized runs longer to reach setpoint on every cold morning, and over years that gap between what the equipment was built for and what it is asked to do shows up in the heat exchanger first. A contractor quoting a replacement here measures the house, checks the ductwork, and confirms that the new unit fits the load before anything else gets priced.

Ductwork laid out for a furnace that is no longer in the house is what shapes the installation job here more than anything the equipment itself requires. Half the homes in Kitsap County, Washington were built in 1986 or earlier (2020-2024 ACS 5-year). That puts a large share of the county's homes in a range where the duct layout was designed around airflow demands that differ from what a modern furnace produces. A contractor assessing the job measures existing trunk lines and branch runs before the new unit is ever quoted, because undersized or poorly routed passages push back against the equipment regardless of its rated output. The electrical service gets the same check: what the panel was originally set up to handle and what the replacement unit will draw on startup are two different numbers.
What a Furnace Installation Covers

The furnace itself sits inside the home, most often in a basement, utility room, or closet. It is the central unit that generates heat and pushes conditioned air into the living space. A new installation means a physical unit going into that location, connected to the home's existing air distribution pathway.
The thermostat mounts on an interior wall and gives the homeowner control over when the system runs and at what setpoint. The flue or venting pipe runs from the furnace to an outside exhaust point, carrying combustion gases out of the house. A new furnace also pairs with a filter housing at the air intake, which a contractor positions to catch particulates before they reach the heat exchanger.
The drawing shows a general layout of these components, and a licensed contractor determines exactly how each one applies to your home.
Find a contractor in Kitsap CountyKitsap County, by the numbers
1 severe weather event was recorded in Kitsap County, Washington 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 Kitsap County, Washington were built in 1986 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesKitsap County, Washington holds 116,970 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 70.1% of the occupied homes in Kitsap County, Washington (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace & HVAC Installation Rules for Kitsap County, Washington5 codes, standards & licenses
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 Kitsap County, Washington
Washington requires contractor registration rather than an HVAC licence: every contractor must register with the Department of Labor and Industries, and advertising, bidding or working as a contractor without that registration is a gross misdemeanour.
