Tell us about the job
Takes about a minute. No obligation.

A heat pump running through a Vermont winter is working against the cold, not with it, and the refrigerant circuit carries that burden every day. Homes in Orange County, VT run heat about nine months a year, from September through May. The defrost cycle runs repeatedly across those months, and its controls, sensors, and reversing valve collect wear in proportion. By the time a fault appears, the compressor and the coil have already logged a full season of cold-weather cycling, which tells a contractor far more about what failed than the age of the unit does. A refrigerant pressure reading off from what it should be, or a defrost board that trips late, points to accumulated load rather than a random part failure.

Half the homes in Orange County, Vermont were built in 1978 or earlier (2020-2024 ACS 5-year). A house built for one generation of heating equipment and later fitted with a heat pump carries that history in its wiring connections, refrigerant line routing, and junction points. When a contractor opens the unit, what they are checking is whether those adaptations were done to the tolerances a heat pump actually requires. A loose or corroded connection that worked adequately for an older system can cause a heat pump to fault under load. Parts availability matters here too: a system retrofitted into older housing often means a unit that has been running longer, and what the opened system contains determines whether a failed component can be sourced or whether the repair path changes.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit is the piece most homeowners recognize: a metal cabinet that sits on a pad beside the house and holds the compressor and the outdoor coil. The compressor is where most repair calls begin. When it labors or fails, the whole system stops moving heat.
Inside the house, the air handler holds the indoor coil and the blower fan, and it is where refrigerant lines from the outdoor unit terminate. The refrigerant lines themselves, the expansion valve, and the reversing valve are the other pieces a contractor traces when the outdoor unit checks out but the system still does not perform.
The drawing shows a typical layout, and a licensed contractor determines which parts and conditions apply to your specific home.
Find a contractor in Orange CountyOrange County, Vermont, by the numbers
93 severe weather events were recorded in Orange County, Vermont 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 Orange County, Vermont were built in 1978 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOrange County, Vermont holds 15,078 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 83.2% of the occupied homes in Orange County, Vermont (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards for Heat Pump Repair in Orange County, Vermont2 sourced rules & standards
Licensing Rules for HVAC Repair in Orange County, Vermont
Vermont splits the trade across two specialty licences and a contractor may hold one without the other: field A1 covers automatic gas or oil heating including geo-thermal and ground source heat pumps, and field C3 covers refrigeration or air conditioning including air-to-air heat pumps.
Vermont reaches HVAC work through its electricians’ licence rather than an HVAC licence, and the requirement stops at the front door of a house: anyone performing electrical work in Vermont must be licensed as an electrician unless the work is in a residential building containing two or fewer dwelling units.
Weather Load in Orange County
Heat pumps work harder when outdoor conditions swing wide, and the wear that accumulates from those swings is what drives repair calls. Knowing what the weather here actually does tells you something real about what the equipment is up against.
93 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.