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Before a contractor can tell you whether a failed reversing valve or a struggling compressor needs replacement, they have to sort out how much of the damage comes from use and how much from the conditions the system has been running against. 217 severe weather events were recorded in McHenry County, Illinois between 2015 and 2024. At that rate, severe weather is a standing feature of operating a heat pump here, not an occasional disruption. Components that cycle hard through repeated weather stress, particularly the refrigerant circuit and the electrical controls, show wear patterns a contractor reads differently than they would in a quieter area. That distinction changes which parts get ordered and what the final scope looks like.
A heat pump sitting in a house built for an earlier generation of equipment has often been serviced, patched, or partially replaced before the current owner arrived. Half the homes in McHenry County, Illinois were built in 1989 or earlier (2020-2024 ACS 5-year). That history matters most once the unit is open: what a contractor finds may be a system whose key components draw from a parts catalog that has since been discontinued or consolidated, which changes both what gets ordered and how long the job takes to close.
The Parts of a Heat Pump a Contractor Checks First
The outdoor unit sits on a pad beside the house and holds the compressor, which drives the whole system, along with the refrigerant coil and a fan that moves air across it. When a heat pump stops heating or cooling, the compressor and that outdoor coil are where a contractor looks first.
Inside the house, the air handler holds a second coil and a blower that pushes conditioned air through the home. Alongside it sits the reversing valve, a component that tells the system which direction to run. Both pieces are common sources of faults when the system behaves erratically or loses capacity on one mode.
The drawing shows the general layout of these components, and a licensed contractor determines what applies to your specific house and system.
Get matched in McHenry CountyMcHenry County, by the numbers
217 severe weather events were recorded in McHenry 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 McHenry County, Illinois were built in 1989 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesMcHenry County, Illinois holds 121,329 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 82.7% of the occupied homes in McHenry County, Illinois (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Heat Pump Repair in McHenry County, Illinois1 sourced rules & standards
Licensing Rules for HVAC Repair in McHenry 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 McHenry County, Year by Year
Extreme weather puts heat pumps under load at the moments they are least able to absorb stress, and how often that happens in a given area shapes how hard the equipment works over its lifetime. Repair needs in McHenry County track local conditions, which is why the weather record here is part of the picture.
217 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.