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Sizing a central AC system for this part of Connecticut starts with what the compressor actually faces. Homes in Southeastern Connecticut Planning Region, CT run cooling about two months a year, from July through August. After months of sitting idle, seals dry, refrigerant can settle, and contactors that looked fine in September show their faults the first time they close in summer heat. A contractor doing the load calculation here accounts for that idle period as part of the install decision, not an afterthought. The equipment chosen and the way it is commissioned both reflect a system that must start cold and perform immediately, with no gradual warm-up period to catch small problems before the hottest days arrive.
Ductwork laid out for the systems of an earlier era was not designed around the airflow demands of a current central AC unit. Half the homes in Southeastern Connecticut Planning Region, Connecticut were built in 1969 or earlier (2020-2024 ACS 5-year). That gap is where installation work in this region gets complicated: a contractor has to establish whether the existing duct runs, their diameters, their routing, and their connections can carry what a new system will push through them. If they cannot, the duct work becomes a larger part of the job than the equipment itself. The electrical panel faces the same question, since a new unit's load may exceed what the existing service was sized for.
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 the condenser coil. The indoor air handler or furnace sits in a utility space, basement, or closet and holds the evaporator coil that the refrigerant lines connect to.
A refrigerant line set runs between the two units, carrying refrigerant through insulated copper tubing that gets routed along the exterior or through interior walls. The thermostat goes on an interior wall of the living space and gives the homeowner control over when the system runs.
The drawing shows a typical layout, and a licensed contractor determines exactly how each piece is positioned and connected in your home.
Find a contractor in Southeastern Connecticut Planning RegionSoutheastern Connecticut by the Numbers
Half the homes in Southeastern Connecticut Planning Region, Connecticut were built in 1969 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSoutheastern Connecticut Planning Region, Connecticut holds 126,425 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 65.1% of the occupied homes in Southeastern Connecticut Planning Region, Connecticut (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards for Central AC Installation in Southeastern Connecticut Planning Region, Connecticut9 sourced rules and standards
What the installation looks like on your end
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 Southeastern Connecticut Planning Region, Connecticut
Connecticut requires a state licence to perform, or to advertise, heating, piping and cooling work: no person may practise an occupation this chapter covers without first obtaining one.