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A contractor quoting a heat pump install in Greene County starts with the house: its insulation, its orientation, its square footage, its leakage. 33 severe weather events were recorded in Greene County, Illinois between 2015 and 2024. At that rate, severe weather is an occasional fact of life here rather than a standing operating condition, so it does not drive the sizing decision the way it might elsewhere. What drives it is the building itself. A contractor who gets the load calculation right for this structure picks equipment that runs efficiently in the conditions Greene County actually delivers most of the time.
Ductwork laid down for older heating systems was sized and routed for that equipment, and a heat pump moves air differently enough that what is already in the walls determines how the installation goes. Half the homes in Greene County, Illinois were built in 1957 or earlier (2020-2024 ACS 5-year). A contractor pricing a heat pump here opens that question early: whether the existing runs and returns can carry the volume the new system needs, or whether sections have to be replaced, rerouted, or added. The electrical service is a separate check. What those two assessments turn up sets the real scope of the job.
What Gets Installed With a New Heat Pump
The outdoor unit sits on a pad beside the house and holds the compressor and the coil that pulls heat from or releases heat to the outside air. The indoor air handler mounts inside, often in a closet, utility room, or attic, and moves conditioned air through the home's existing duct system.
A refrigerant line set runs between the two units, carrying refrigerant back and forth through insulated copper tubing. A thermostat, mounted on an interior wall, is the control point where a homeowner sets temperatures and, on most modern systems, monitors performance.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to this house.
Get matched in Greene CountyGreene County by the numbers
33 severe weather events were recorded in Greene 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 Greene County, Illinois were built in 1957 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesGreene County, Illinois holds 5,785 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 78.2% of the occupied homes in Greene County, Illinois (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Heat Pump Installation in Greene County, Illinois1 sourced rules & standards
Licensing Rules for Greene 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 Greene County
Heating and cooling equipment in Greene County works against whatever the local climate throws at it, and that workload shapes what a system needs to handle over its life. A heat pump sized and installed for local conditions holds up better than one spec'd to a generic standard.
33 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.