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A contractor quoting a mini-split here prices a system that will earn its keep entirely through heating. Homes in Clark County, WA have essentially no cooling season — no month of the year is warm enough to call for it. The compressor and the refrigerant circuit do run in heat-pump mode through the cold months, so the coil, the refrigerant lines, and the electrical connections all see real work. What a contractor has to establish before sizing is how cold the outdoor unit gets on the hardest nights, because a heat pump's capacity drops as temperatures fall, and a unit undersized for heating cannot recover by pointing to a cooling load that does not exist here.
Ductwork in a house runs on what was put in when the house was built, and electrical panels do too. Half the homes in Clark County, Washington were built in 1993 or earlier (2020-2024 ACS 5-year). A mini-split does not use ducts, which removes one variable, but it does add load to a panel that was designed around different equipment. A contractor quoting an install here checks the service panel early, because undersized service means an electrical upgrade lands on the same bill as the mini-split itself.
The Mini-split Parts a Contractor Sizes and Places for an HVAC Install
The indoor air handler mounts high on an interior wall in the room being conditioned, which is where a homeowner notices it first. It draws room air across its coil and pushes treated air back out. Some installations use more than one indoor unit, each placed in a separate room or zone.
The outdoor unit sits on a pad or bracket outside the house, typically along an exterior wall, and houses the compressor and the main mechanical components. A refrigerant line set and a condensate drain line run through a small penetration in the wall to connect the two units, and a dedicated electrical feed runs to the outdoor unit.
The drawing shows a representative layout, and a licensed contractor determines exactly how each piece is positioned and routed in your specific home.
Find a contractor in Clark CountyClark County, by the numbers
13 severe weather events were recorded in Clark 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 Clark County, Washington were built in 1993 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesClark County, Washington holds 204,375 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 66.4% of the occupied homes in Clark County, Washington (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards Governing Mini-Split Installation in Clark County, Washington1 sourced rules and standards
Licensing Rules for Clark 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.