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Sizing a heat pump for Lewis County means working out what happens at the cold end of the season, not just the average. Homes in Lewis County, WA run heat about ten months a year, from September through June. As outdoor temperatures drop through January and February, a heat pump's output falls precisely when the house needs it most. A contractor quoting an install here has to establish where that crossover point lands for this house, and what backup heat kicks in below it. Get that wrong and the backup element runs hard through the coldest weeks, driving bills the homeowner did not expect.
Ductwork laid out for a furnace or a much smaller cooling load answers a different set of demands than a heat pump puts on it. Half the homes in Lewis County, Washington were built in 1980 or earlier (2020-2024 ACS 5-year). That age of stock was ducted around equipment that has since been replaced, and the gap between what the ducts were built for and what a heat pump needs is where most installation decisions get made. A contractor sizing the new unit also has to establish whether the existing duct runs can move the volume of air the system requires, and whether the electrical service can handle the load, before the equipment selection means anything.
What Gets Installed With a New Heat Pump
The outdoor unit is the piece a homeowner sees first, mounted on a pad beside the house. Inside, an air handler takes its place in a utility space, closet, or attic. These two units are the core of what a contractor puts in, and both arrive as part of the same system.
A refrigerant line set runs between the outdoor unit and the air handler, connecting the two through the wall or floor. A thermostat goes on an interior wall where it reads the living space and signals the system to run. The condensate drain line carries moisture away from the air handler to a floor drain or outside.
The drawing shows a typical layout, and a licensed contractor determines exactly how each piece fits the configuration of your house.
Get matched in Lewis CountyLewis County, by the numbers
Half the homes in Lewis County, Washington were built in 1980 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesLewis County, Washington holds 36,512 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 75.8% of the occupied homes in Lewis County, Washington (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Behind Heat Pump Installation in Lewis County, Washington1 sourced rules and standards
What Lewis County and Washington Require for HVAC Installation
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.