Tell us about the job
Takes about a minute. No obligation.
Sizing central AC for a home here is not a catalog exercise. 127 severe weather events were recorded in Livingston County, Michigan between 2015 and 2024. At that rate, severe weather is a standing condition rather than a rare event, and a contractor who ignores it will likely spec a system that runs harder than it should from its first summer. Duct routing, refrigerant line protection, and equipment placement all change when the outdoor environment is this active. A properly sized and seated install carries that load without being pushed to its limits every season.
Existing ductwork is where a central AC installation in Livingston County gets settled. Half the homes in Livingston County, Michigan were built in 1991 or earlier (2020-2024 ACS 5-year). Houses built in that era were sized and ducted for the systems available then, and what was adequate for that equipment does not automatically carry a modern unit at the volumes and static pressures it needs. A contractor will check duct sizing, condition, and return-air configuration before anything else, because those findings change the scope of the job more than the equipment choice does.
What a Central AC System Includes
The outdoor condenser unit sits outside the house, usually on a concrete pad at grade, and holds the compressor and condenser coil. The indoor air handler or furnace-mounted evaporator coil sits inside, most often in a basement, utility closet, or attic, and is the piece that works with the air already moving through the house.
A copper refrigerant line set runs between the two units, connecting the indoor and outdoor sides into a single system. A thermostat on an interior wall ties everything together, giving the homeowner a single point of control over when the system runs.
The drawing shows a typical layout, and a licensed contractor determines exactly how each piece fits the conditions in your house.
Find a contractor in Livingston CountyLivingston County, by the numbers
127 severe weather events were recorded in Livingston 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 Livingston County, Michigan were built in 1991 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesLivingston County, Michigan holds 80,367 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 86.9% of the occupied homes in Livingston County, Michigan (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards for Central AC Installation in Livingston County, Michigan10 sourced rules and standards
What the installation actually looks like
Split-system central air conditioners rated below 45,000 Btu/h manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Split-system central air conditioners rated at or above 45,000 Btu/h manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Split-system central air conditioners manufactured between January 1, 2015 and December 31, 2022 had to meet 13 SEER, the metric that preceded SEER2.
Single-package central air conditioners manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Space-constrained central air conditioners manufactured on or after January 1, 2023 must meet a federal minimum of 11.7 SEER2.
Federal efficiency standards for split-system central air conditioners and heat pumps are set on each certified combination of outdoor unit and indoor coil rather than on the outdoor unit alone.
Residential and light commercial air conditioning and heat pump systems assembled in the field, including mini-splits and unitary systems, may not be installed on or after January 1, 2025 using a refrigerant with a global warming potential above 700.
A field-assembled system whose specified components were all manufactured or imported before January 1, 2025 carries no installation compliance date under the refrigerant restrictions and may still be installed.
Licensing and Legal Requirements in Livingston 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 Livingston County
Weather in this part of Michigan puts real demands on heating and cooling equipment over its lifetime. Sizing and installing a central AC system here means accounting for local conditions, not averages drawn from somewhere else.
127 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.