Tell us about the job
Takes about a minute. No obligation.
Sizing a central AC system for Ontario County requires a contractor to account for what happens on both sides of a very short season. Homes in Ontario County, NY run cooling in a single month of the year, July. The compressor, condenser fan, and contactor sit dormant from August through June. Components left idle that long can develop refrigerant leaks, seized contactors, or capacitor failures that produce no warning until the system is called on to run. A load calculation done before installation has to account for that pattern, because a system that starts the season already compromised will fail at peak demand, when scheduling a contractor is hardest.
Ductwork laid down for equipment that has since been replaced two or three times rarely lines up cleanly with what a new central AC system needs to push through it. Half the homes in Ontario County, New York were built in 1976 or earlier (2020-2024 ACS 5-year). A contractor pricing an installation in stock that old is not sizing a unit and ordering it. They are tracing what is already in the walls, deciding which runs carry the new load and which have to be resized or rerouted, and checking whether the electrical service will support what a modern condenser draws. The equipment gets chosen after that work is done.
What Gets Installed With a New Central AC
The outdoor condenser unit sits outside the house, usually on a concrete pad beside the foundation, and houses the compressor and condenser coil. Inside, the air handler or furnace cabinet stands in a utility closet, basement, or attic and holds the evaporator coil that the refrigerant lines connect to.
A refrigerant line set runs between the two units through a small penetration in the wall, carrying refrigerant back and forth. The thermostat mounts on an interior wall and serves as the control point for the whole system, telling the equipment when to run.
The drawing shows the general layout of a central AC system, and a licensed contractor determines what applies to your specific home.
Get matched in Ontario CountyOntario County, NY, by the numbers
225 severe weather events were recorded in Ontario County, New York 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 Ontario County, New York were built in 1976 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOntario County, New York holds 53,379 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 73.7% of the occupied homes in Ontario County, New York (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Central AC Installation in Ontario County, New York8 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 Ontario County
Weather stress is a real load factor for central AC equipment. What Ontario County sees year to year shapes how hard a system has to work and how carefully it needs to be sized and installed.
225 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.