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A contractor quoting a central AC installation in Pulaski County starts with the house, the ductwork, and how the last system was put in, because those are the variables that actually decide whether a new unit performs. 69 severe weather events were recorded in Pulaski County, Illinois between 2015 and 2024. At that rate, severe weather is an event here rather than a steady condition, and it does not explain a compressor that gave out or a system that never cooled the upstairs right. What a contractor has to establish before sizing a replacement is how well the existing duct layout moves air, and whether a previous install left the refrigerant charge or the airflow set correctly.
Ductwork laid out for older heating equipment was sized and routed around the assumptions of its time, and a new central AC unit runs on different ones. Half the homes in Pulaski County, Illinois were built in 1969 or earlier (2020-2024 ACS 5-year). A contractor installing a new system in houses from that era has to assess whether existing duct runs can move the air a modern unit produces, and whether the electrical service will carry the load, before anything else on the job is priced. Those two findings shape the scope. The equipment selection comes after.
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 that shed heat to the outside air. Inside, the air handler or furnace cabinet takes the other half of the system, drawing warm air across the evaporator coil and pushing conditioned air back through the house.
A copper refrigerant line set runs between the two units, connecting the indoor and outdoor sides through the wall or floor. The thermostat mounts on an interior wall and is the control point a homeowner touches every day, telling the system when to run and when to stop.
The drawing shows how these pieces fit together in a typical layout, and a licensed contractor determines exactly what your house requires.
Get matched in Pulaski CountyPulaski County by the Numbers
69 severe weather events were recorded in Pulaski County, Illinois 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 Pulaski County, Illinois were built in 1969 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesPulaski County, Illinois holds 2,851 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 68.2% of the occupied homes in Pulaski County, Illinois (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Central AC Installation in Pulaski County, Illinois9 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.
Licensing and Legal Requirements in Pulaski County, Illinois
Illinois leaves HVAC licensing to the municipality: state law lets the corporate authorities of each city or village examine, license and regulate heating, air conditioning and refrigeration contractors, and caps the licence fee they may charge at $50 — so who licenses you depends on the town you work in.
Severe Weather Events in Pulaski County
Weather puts real demands on cooling equipment, and those demands vary by location. A system sized and installed for what Pulaski County actually sees will run more reliably than one specified without that context.
69 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.