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A heat pump here runs its compressor hard in both directions: heating through a long Vermont winter, then switching over to pull heat out of the house in summer. Homes in Addison County, VT run heat about nine months a year, from September through May. The reversing valve, the defrost controls, and the coil all carry that combined load, and a contractor diagnosing a repair looks at those components before anything else. Refrigerant charge and coil condition tell more about the state of the system than a nameplate date does.
Repair work on a heat pump here starts with what the house already has running through it. Half the homes in Addison County, Vermont were built in 1977 or earlier (2020-2024 ACS 5-year). That means a contractor opening a system is also looking at wiring gauges and line sets that predate the equipment by a wide margin, and what they find there changes which parts get ordered. A compressor swap on a unit that has been pulling against undersized electrical service reads differently on a bill than one that has not. The opened system tells the contractor which of those it is.
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 is where most repair work begins. The compressor moves refrigerant through the system, and when it labors or fails, the whole system feels it. The coil wrapped around it and the fan above it are the other outdoor pieces a contractor reaches first.
Inside the house, the air handler hangs in a utility space or a mechanical closet and pushes conditioned air into the living areas. The expansion valve and the refrigerant lines that run between the two units round out what a contractor traces when a problem is not immediately obvious at either end.
The drawing shows the general layout of a heat pump system, and a licensed contractor determines which pieces apply to your particular house.
Find a contractor in Addison CountyAddison County, by the numbers
169 severe weather events were recorded in Addison 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 Addison County, Vermont were built in 1977 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesAddison County, Vermont holds 17,617 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 79.3% of the occupied homes in Addison 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 Addison County, Vermont2 sourced rules and standards
Licensing and Legal Requirements in Addison 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.
Severe Weather Events in Addison County, Year by Year
Weather puts a load on heat pump systems. The harder a unit works through cold snaps, ice, and power fluctuations, the more wear it accumulates, and repair needs in Addison County reflect the conditions the equipment actually faces here.
169 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.