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A contractor quoting central AC installation in San Juan County has to settle one question before anything else: whether the equipment will ever be asked to run. Homes in San Juan County, CO have essentially no cooling season — no month of the year is warm enough to call for it. A compressor that never cycles does not escape wear. Seals dry out, refrigerant migrates when the system sits cold for years, and the first time a homeowner turns the unit on during an unusual warm spell is when those faults surface. Sizing and efficiency ratings are secondary concerns here. What a contractor prices first is whether the installation itself makes sense for the house.
Ductwork in much of San Juan County's housing stock was laid out for earlier equipment, and what sits behind the walls today reflects those original decisions, not the load a modern central AC unit puts on the system. Half the homes in San Juan County, Colorado were built in 1979 or earlier (2020-2024 ACS 5-year). A contractor installing new central AC has to trace what is actually there: whether the existing ducts move the right volume of air, and whether the electrical service handles what the new unit draws. Those are separate questions, and each one has to be answered before anything gets priced.
What a Central AC Installation Puts in Your Home
The outdoor condenser unit sits on a concrete pad beside the house and holds the compressor and condenser coil, the two components doing the heaviest work in the system. Inside, the air handler mounts in a utility space, basement, or closet and pushes conditioned air through the home. Together, these are the core of what gets purchased and placed.
A copper refrigerant line set runs between the outdoor and indoor units, connecting them through a wall or floor penetration. The thermostat goes on an interior wall where it reads the home's temperature and tells the system when to run. An expansion valve, usually housed near the air handler, controls how refrigerant moves between the two units.
The drawing shows a typical layout, and a licensed contractor determines exactly how each piece fits the specific conditions of your house.
Get matched in San Juan CountySan Juan County, Colorado, by the numbers
95 severe weather events were recorded in San Juan County, Colorado 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 San Juan County, Colorado were built in 1979 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSan Juan County, Colorado holds 738 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 52.9% of the occupied homes in San Juan County, Colorado (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Central AC Installation in San Juan County, Colorado8 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.
Severe Weather Events in San Juan County
San Juan County's climate puts real demands on cooling equipment, and those demands are shaped by local conditions that vary year to year. Sizing and installing a central AC system here means accounting for what this place actually does to equipment over time.
95 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.