What Michigan homes are up against.
NOAA National Centers for Environmental Information, Storm Events Database, bulk CSV export, events 2015-01-01 through 2024-12-31. · U.S. Census Bureau, 2020-2024 American Community Survey 5-Year Estimates
What a contractor has to settle before quoting a heat pump is how hard the existing equipment has been running, and for how long each time. 5,922 severe weather events were recorded in Michigan between 2015 and 2024. That rate of demand is spread across a state large enough to contain very different working conditions from one property to the next, which means the statewide figure sets the floor but leaves the site-level question open. A unit that has been holding capacity through repeated hard runs will show it differently than one that has been asked for less. The spec a contractor writes follows from what they find at the house, and that varies.
Before a contractor can specify equipment, they have to confirm what is already in the house: duct sizing, electrical service, and insulation levels that were sized for something else entirely. None of those can be read from the outside. Half the homes in Michigan were built in 1972 or earlier (2020-2024 ACS 5-year). A house built before modern efficiency standards were written may have ductwork that moves the wrong volume of air for a heat pump, or a panel that was never sized to carry the load one draws. The contractor's first job is finding out which of those conditions the house actually has.
Does your county put extra stress on HVAC equipment?
2015–2024 · Source: NOAA National Centers for Environmental Information, Storm Events Database.
A condenser sitting outside in Michigan faces wind, ice, hail, and temperature swings that push equipment hard over a season and harder over a service life. Where a unit sits on the property, how well it is anchored, and whether its capacity is sized for what the climate actually delivers all shape how long it holds up. The licensed contractor you are matched with works that out before anything is specified or installed.
Michigan HVAC Installation and Repair License Requirements
Michigan sets its own rules for who can perform HVAC installation and repair work, and the provisions below come directly from state law rather than from any summary of it.
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.
A state licensing requirement for this trade means that performing HVAC work without the proper credential is not a legal option, regardless of who hires whom. That applies to the contractor a homeowner brings in, not to the homeowner filing a permit. The contractors this site routes requests to hold the license these provisions describe, and a request does not move forward until that check is satisfied.
Read the source provisions2 provisions
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.