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Sizing a heat pump for Washtenaw County starts with what the area actually puts the equipment through. 166 severe weather events were recorded in Washtenaw County, Michigan between 2015 and 2024. At that rate, severe weather is a standing feature of the operating environment, and a contractor who treats it as an edge case will undersize the system or skip installation details that would otherwise seem optional. Refrigerant line routing, electrical service capacity, and outdoor unit placement all carry more weight here than they would in a quieter county. A contractor quoting this work prices those details in from the start.
Ductwork laid down for a furnace was sized, routed, and sealed for the airflow patterns a furnace produces. A heat pump moves air differently, and older duct systems frequently need assessment before a contractor can confirm they will carry the new equipment without pressure or comfort problems. Half the homes in Washtenaw County, Michigan were built in 1978 or earlier (2020-2024 ACS 5-year). That spread in the housing stock is why electrical service is the second thing a contractor checks: panels in houses of that vintage were not built to the load a modern heat pump draws. What the ductwork and the panel actually show, once a contractor looks at them, is what sets the 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 condenser coil, which are the parts that move heat between the refrigerant and the outside air. Inside, the air handler mounts in a utility space, closet, or attic and pushes conditioned air through the home. These two units are what a homeowner buying a heat pump system is buying.
A refrigerant line set runs between the outdoor unit and the air handler, carrying refrigerant back and forth through insulated copper tubing. A thermostat goes on an interior wall where it reads the home's temperature and tells the system when to run. Some installs also include a secondary electric resistance element inside the air handler for backup heat on the coldest days.
The drawing shows a typical layout, and a licensed contractor determines exactly how each piece fits this house.
Get matched in Washtenaw CountyWashtenaw County, by the numbers
166 severe weather events were recorded in Washtenaw County, Michigan 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 Washtenaw County, Michigan were built in 1978 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesWashtenaw County, Michigan holds 159,782 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 61.6% of the occupied homes in Washtenaw County, Michigan (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesHeat Pump Installation Rules & Standards for Washtenaw County, Michigan2 sourced codes and standards
Licensing and Legal Requirements in Washtenaw County, Michigan
Michigan issues the mechanical contractor’s licence by classification: HVAC equipment, ductwork, refrigeration, hydronic heating and cooling, and limited or unlimited heating and refrigeration service are each a separate classification a contractor has to hold.
Michigan requires a mechanical contractor’s licence: nobody may install, alter or service the regulated mechanical work unless they, or an employee, hold a licence from the department that has not been revoked or suspended.
Severe Weather Events in Washtenaw County
Weather in this part of Michigan puts real demands on heating and cooling equipment over its working life. A heat pump sized and installed for local conditions holds up better than one that was not, which is why the weather record here is part of the installation picture.
166 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.