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A contractor called out to repair a heat pump in Wood County has to account for what the equipment has already been through before they can say which component failed and why. 118 severe weather events were recorded in Wood County, Wisconsin between 2015 and 2024. At that rate, severe weather is a standing feature of life for every system running here, and wear on reversing valves, compressor windings, and capacitors reflects it. A part that looks like it simply aged out may have aged out faster because of the load this climate puts on a system running year-round.

A heat pump running in a house built before the equipment it now runs had been designed faces a specific repair problem: the parts it takes. Half the homes in Wood County, Wisconsin were built in 1972 or earlier (2020-2024 ACS 5-year). That puts a contractor opening a unit here in the position of confirming not just what failed, but whether a replacement part is still being made for it. When it is, the repair is straightforward. When it is not, the scope changes entirely, and the homeowner is deciding between a sourced alternative and a system replacement before the appointment is over.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit sits outside the house and holds the compressor and the condenser coil. The compressor is where most repair calls begin. When it fails, the system stops moving heat entirely. The condenser coil pulls heat from or releases heat to the outside air, and a bent, dirty, or damaged coil forces the compressor to work harder than it should.
Inside the house, the air handler holds the evaporator coil and the blower fan. The evaporator coil is where the refrigerant does its work on the indoor air, and a refrigerant leak will show up here first. The blower fan pushes conditioned air through the house, and a failed motor or a worn capacitor will stop that airflow cold. The reversing valve, which sits inside the outdoor unit, is what lets the system switch between heating and cooling. A stuck or failed reversing valve is the reason a heat pump sometimes heats when it should cool, or does neither.
The drawing shows a typical layout, and a licensed contractor determines which components apply and what service is needed in your specific home.
Get matched in Wood CountyWood County, Wisconsin, by the numbers
118 severe weather events were recorded in Wood County, Wisconsin 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 Wood County, Wisconsin were built in 1972 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesWood County, Wisconsin holds 34,755 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 72.6% of the occupied homes in Wood County, Wisconsin (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards Behind Heat Pump Repair in Wood County, Wisconsin2 sourced rules and standards
Licensing Rules for HVAC Repair in Wood County, Wisconsin
A Wisconsin business that employs a certified HVAC qualifier is a certified HVAC business, and no city or county may require it to hold a local certification or licence on top of that.
Wisconsin requires a state HVAC contractor registration: no person or business may install or service heating, ventilating or air conditioning equipment, or offer to, without one.
Severe Weather Events in Wood County
Extreme weather puts real strain on heat pump systems, which run harder and wear faster when conditions push outside normal range. How often that happens in Wood County shapes what local repair work actually looks like.
118 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.