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A heat pump sized for a mild climate will be undersized for Oakland County. 210 severe weather events were recorded in Oakland County, Michigan between 2015 and 2024. At that rate, severe weather is part of the normal working life of any system installed here, which means a contractor has to build that load into equipment selection, refrigerant line sizing, and mounting decisions before anything else. A catalog spec chosen without that context produces a system that runs at its ceiling when the county asks the most of it.
Ductwork laid down for a gas furnace moves air at higher temperatures and lower volumes than a heat pump needs. Half the homes in Oakland County, Michigan were built in 1975 or earlier (2020-2024 ACS 5-year). A contractor sizing a heat pump here has to evaluate what that existing duct system actually does under the load a heat pump puts on it, not just whether it is present. Sheet metal that worked fine for decades of forced-air heating can still restrict airflow enough to undercut efficiency and comfort when the source changes. The electrical service gets the same scrutiny, since a heat pump's draw at startup and steady state has to match what the panel can deliver.
What Gets Installed With a New Heat Pump
The outdoor unit is the piece a homeowner sees first, mounted on a concrete pad or bracket outside the house, and it holds the compressor and the main coil that do the heat-exchange work. Inside, the air handler sits in a mechanical room, basement, or closet and moves conditioned air through the home's supply system.
A refrigerant line set runs between the two units, carrying refrigerant back and forth through insulated copper tubing that passes through an exterior wall. A thermostat goes on an interior wall where it reads the living space and signals the system when to run.
The drawing shows a representative layout, and a licensed contractor determines what fits the configuration of your specific house.
Find a contractor in Oakland CountyOakland County, by the numbers
210 severe weather events were recorded in Oakland 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 Oakland County, Michigan were built in 1975 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOakland County, Michigan holds 561,348 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 72.7% of the occupied homes in Oakland County, Michigan (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards for Heat Pump Installation in Oakland County, Michigan2 sourced rules and standards
Licensing and Legal Requirements in Oakland 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 Oakland County
Heat pump performance is tied directly to what the local climate puts it through. The number of severe weather events a county records over time is a real measure of the workload a system here has to handle, which is why it belongs on a page about heat pump installation.
210 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.