Tell us about the job
Takes about a minute. No obligation.
Sizing a central AC system for Franklin County starts with knowing exactly how little the compressor is asked to run. Homes in Franklin County, WA run cooling about two months a year, from July through August. The compressor, condenser fan, and contactor spend most of the calendar off, and long idle periods let small faults hide until the first genuinely hot day forces the system on. A contractor quoting an install here has to account for that: a system undersized even slightly will show it immediately, because there is no shoulder season to reveal problems gradually. Proper load calculations and a clean commissioning check are what prevent that first July call.
Ductwork is where a central AC installation in Franklin County gets decided. Half the homes in Franklin County, Washington were built in 1997 or earlier (2020-2024 ACS 5-year). Houses from that period were built for mechanical cooling from the start, which means the service panel in a typical home here was sized with that load in mind. What a contractor has to open and measure is the duct system: whether the runs, returns, and register placement will carry a new unit's airflow without a redesign. That assessment drives the quote more than anything else on the job.
What Gets Installed With a New Central AC
The outdoor condenser unit sits outside the house, usually on a concrete pad along a side or rear wall, and holds the compressor and condenser coil. Inside, the air handler mounts in a utility space, basement, or attic and moves conditioned air through the home. These two units are the core of what a contractor puts in.
A refrigerant line set runs between the outdoor and indoor units, and a thermostat goes on an interior wall where it can read the home's air accurately. The contractor also fits an expansion valve into the indoor unit, which controls how refrigerant flows between the two sides of the system.
The drawing shows a typical layout, and a licensed contractor determines exactly how that maps to your house.
Get matched in Franklin CountyFranklin County, by the numbers
40 severe weather events were recorded in Franklin 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 Franklin County, Washington were built in 1997 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFranklin County, Washington holds 31,183 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 71.0% of the occupied homes in Franklin County, Washington (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Central AC Installation in Franklin County, Washington9 sourced rules and standards
What the installation actually looks like
Split-system central air conditioners rated below 45,000 Btu/h manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Split-system central air conditioners rated at or above 45,000 Btu/h manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Split-system central air conditioners manufactured between January 1, 2015 and December 31, 2022 had to meet 13 SEER, the metric that preceded SEER2.
Single-package central air conditioners manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Space-constrained central air conditioners manufactured on or after January 1, 2023 must meet a federal minimum of 11.7 SEER2.
Federal efficiency standards for split-system central air conditioners and heat pumps are set on each certified combination of outdoor unit and indoor coil rather than on the outdoor unit alone.
Residential and light commercial air conditioning and heat pump systems assembled in the field, including mini-splits and unitary systems, may not be installed on or after January 1, 2025 using a refrigerant with a global warming potential above 700.
A field-assembled system whose specified components were all manufactured or imported before January 1, 2025 carries no installation compliance date under the refrigerant restrictions and may still be installed.
Licensing and Legal Requirements in Franklin 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.
Severe Weather Events in Franklin County
Local weather places real demands on cooling equipment, and those demands vary by location. What the climate does in Franklin County shapes how hard a central AC system works and what it needs to hold up over time.
40 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.