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Central AC sizing in Larimer County starts with an uncomfortable fact for anyone pricing a new system. Homes in Larimer County, CO have essentially no cooling season — no month of the year is warm enough to call for it. A compressor that never turns on still ages: seals dry, refrigerant migrates, and electrical contacts corrode through winters the unit spends sitting. The contractor quoting the job has to account for that idle-period degradation when specifying equipment, because a system rated for a cooling load that never materializes will be oversized and slow to condition the air on the rare day it runs.
Ductwork laid down for an earlier generation of equipment does not automatically suit what a contractor puts in today. Half the homes in Larimer County, Colorado were built in 1993 or earlier (2020-2024 ACS 5-year). That gap between what the house was built with and what runs in it now is where an installation job gets complicated or stays straightforward. A contractor here has to assess whether the existing duct layout moves enough air for a modern system and whether the electrical service handles the load before a unit is ever ordered.
What a Central AC Installation Covers
The outdoor condenser unit sits on a pad beside the house and holds the compressor and condenser coil, which together shed heat from the refrigerant to the outside air. Inside, the air handler or furnace-mounted evaporator coil sits where conditioned air begins its journey through the home. These are the two anchors of the system, and both go in as part of a new installation.
Copper refrigerant lines run between the indoor and outdoor units, and a contractor installs or replaces these as part of the work. The thermostat mounts on an interior wall and gives the homeowner control over the whole system. A condensate drain line also runs from the indoor coil to carry away moisture the coil pulls from the air.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your house.
Get matched in Larimer CountyLarimer County, by the numbers
359 severe weather events were recorded in Larimer 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 Larimer County, Colorado were built in 1993 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesLarimer County, Colorado holds 164,690 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 64.0% of the occupied homes in Larimer 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 Larimer County, Colorado8 sourced rules and standards
What happens on install day
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 Larimer County
Weather puts a measurable load on cooling equipment, and that load varies by location. How hard a system has to work, and how long it lasts doing it, is shaped by what the local climate throws at it year after year.
359 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.