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A contractor quoting central AC in Deschutes County has to settle one question before anything else: how much the compressor will actually be asked to do. Homes in Deschutes County, OR have essentially no cooling season — no month of the year is warm enough to call for it. A compressor that sits idle almost permanently still needs a sound installation. Refrigerant charge, electrical connections, and the condensate path all degrade from disuse and from the temperature swings that come with high-desert winters, not from the summer runtime that justifies a heavier system elsewhere. Sizing to a load that never materializes wastes money on equipment capacity the house will never draw.
Ductwork designed for an earlier generation of heating often takes more work to adapt for central AC than the unit itself does. Half the homes in Deschutes County, Oregon were built in 1998 or earlier (2020-2024 ACS 5-year). A contractor quoting the job here opens walls and measures airflow through what is already in place, because duct runs from that era were sized and routed for different equipment. If the existing ducts cannot carry what the new system needs, the ductwork becomes the larger line item.
What a Central AC System Puts in Your Home
The outdoor condenser unit sits on a pad beside the house and holds the compressor and condenser coil. Inside, an air handler or furnace-mounted evaporator coil takes its place in the mechanical room or utility space. Together these two units are what a homeowner is buying when they purchase a central AC system.
A refrigerant line set runs between the outdoor and indoor units, connecting them through the wall or floor. A thermostat goes on an interior wall where it reads the air temperature and tells the system when to run. The condensate drain line carries moisture away from the indoor coil to a floor drain or outside.
The drawing shows a typical layout, and a licensed contractor determines what fits the specific conditions of your house.
Get matched in Deschutes CountyDeschutes County by the Numbers
135 severe weather events were recorded in Deschutes 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 Deschutes County, Oregon were built in 1998 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesDeschutes County, Oregon holds 99,297 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 70.0% of the occupied homes in Deschutes County, Oregon (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards Governing Central AC Installation in Deschutes County, Oregon10 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 Deschutes 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.
Severe Weather Events in Deschutes County
Extreme weather puts a measurable load on heating and cooling equipment, and that load shapes what a system needs to handle over its working life. Central AC sized and installed for local conditions holds up better than equipment spec'd without that picture.
135 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.