Tell us about the job
Takes about a minute. No obligation.
Sizing a central AC system for a house in Greene County starts with an uncomfortable constraint. Homes in Greene County, NY have essentially no cooling season — no month of the year is warm enough to call for it. The compressor, the condenser fan, and the contactor sit idle through every month of the year, which means wear from cycling never accumulates to expose a bad installation. A contractor who undersizes a unit here will not see the evidence show up in early failures the way they would somewhere the equipment runs hard. That makes the load calculation and the quality of the ductwork connection the only real accountability check, because runtime will never provide one.
Ductwork laid down for one system rarely fits the next one cleanly. Half the homes in Greene County, New York were built in 1972 or earlier (2020-2024 ACS 5-year). A contractor installing central AC in stock like this measures what the existing ducts can actually move, checks where they run, and finds out whether the routing makes sense for the equipment being placed. If the ducts are undersized or routed in ways that choke airflow, the install changes scope before the unit is ever set. The electrical gets the same look, since a service panel from that era carries what it was built to carry, not necessarily what a modern unit draws.
What Gets Installed With a New Central AC
The outdoor condenser unit sits on a concrete pad beside the house and holds the compressor and condenser coil, the two components that do the heaviest work in the refrigerant circuit. Inside, the air handler mounts in a utility closet, basement, or attic and houses the evaporator coil along with the blower that moves conditioned air through the home.
A copper refrigerant line set runs between the two units, connecting the indoor and outdoor sides of the system. The thermostat goes on an interior wall and gives the homeowner direct control over when the system runs and what temperature it holds.
The drawing shows a typical layout, and a licensed contractor determines what applies to this particular house.
Get matched in Greene CountyGreene County, by the numbers
168 severe weather events were recorded in Greene 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 Greene County, New York were built in 1972 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesGreene County, New York holds 29,080 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 77.2% of the occupied homes in Greene County, New York (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards Behind Central AC Installation in Greene County, New York8 sourced rules and standards
What happens once a contractor comes out
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 Greene County
Weather in this part of New York puts real demands on cooling equipment: heat loads shift with storm cycles, humidity spikes after heavy rainfall, and equipment sized for average conditions can fall short when conditions are not average. How hard a central AC system has to work is a local question, and the record below is part of that answer.
168 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.