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A contractor pulling apart a central AC system in Union County is looking at what years of ordinary use have done, not at what storms have done. 68 severe weather events were recorded in Union County, Ohio between 2015 and 2024. At that rate, severe weather is an occasional fact of life here, not a grinding background load on every capacitor and contactor in the county. A compressor that has given out, a coil that is underperforming, a refrigerant circuit that is off: the contractor's first questions are about age and how regularly the system has been serviced, because those are what the record here supports.
Half the homes in Union County, Ohio were built in 1996 or earlier (2020-2024 ACS 5-year). A house does not keep its original cooling equipment for that long, which means the unit a contractor opens today is a replacement, possibly more than one generation removed from what the house started with. That matters for repair because parts availability follows the equipment's own age, not the building's. If the system is old enough that its replacement components are discontinued or back-ordered, the repair scope changes before the contractor quotes a single line item.
The Parts of a Central AC a Contractor Checks First
The outdoor condenser unit sits on a pad beside the house and holds the compressor and condenser coil, the two components a contractor reaches for first when a system stops cooling. The compressor is the heart of the refrigerant circuit, and a failed one is a hard stop. The condenser coil sheds heat to the outside air, and a damaged or fouled coil shows up fast in poor cooling.
Inside the house, the air handler or furnace cabinet holds the evaporator coil and the blower, with the coil sitting above or beside the furnace and the blower pushing conditioned air into the duct system. The refrigerant lines and the expansion valve connect both sides of the system, and the thermostat tells all of it when to run. Wiring faults, a failed capacitor, a blocked drain line, or low refrigerant are the other places a contractor looks when the obvious parts check out.
The drawing shows the general layout of a central AC system, and a licensed contractor determines which components apply and what condition they are in for this particular house.
Get matched in Union CountyUnion County, Ohio, by the numbers
68 severe weather events were recorded in Union County, Ohio 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 Union County, Ohio were built in 1996 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesUnion County, Ohio holds 25,158 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 79.2% of the occupied homes in Union County, Ohio (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards Governing Central AC Repair in Union County, Ohio22 sourced rules and standards
What HVAC Repair Looks Like in Union County
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 Union County, Ohio
An Ohio home construction services contract must include a copy of the supplier's certificate of insurance showing general liability coverage of not less than two hundred fifty thousand dollars.
In Ohio a home construction service means the construction of a residential building, including the repair, improvement, remodel or renovation of an existing structure, and does not include construction on a structure containing four or more dwelling units except for work on an individual dwelling unit within it.
A home construction service supplier in Ohio is defined as a person who contracts with an owner to provide home construction services for compensation and who maintains a general liability insurance policy of not less than two hundred fifty thousand dollars.
The Ohio construction industry licensing board issues state licenses to individuals as heating, ventilating and air conditioning contractors, refrigeration contractors, electrical contractors, plumbing contractors and hydronics contractors.
An Ohio board of county commissioners may accept a valid and unexpired Chapter 4740 license held by a heating, ventilating and air conditioning contractor toward its own licensing requirements for work on one-, two-, or three-family dwelling houses.
An Ohio board of county commissioners may adopt rules licensing heating, ventilating and air conditioning contractors who are not required to hold a state license under Chapter 4740.
In Ohio municipal law a specialty contractor includes heating, ventilating and air conditioning contractors, refrigeration contractors, electrical contractors, plumbing contractors and hydronics contractors.
An Ohio board of county commissioners may not register a specialty contractor who is required to hold a license under Chapter 4740 but does not hold a valid one.
An Ohio municipal corporation may not register a specialty contractor who is required to hold a license under Chapter 4740 but does not hold a valid one.
In Ohio building law a residential building means a one-family, two-family or three-family dwelling house and any accessory structure incidental to it, and does not include an industrialized unit, a manufactured home or a mobile home.
Ohio's contractor licensing chapter reaches only work on a construction project, and a construction project is defined to exclude residential buildings, so an HVAC contractor working on a one-, two-, or three-family dwelling in Ohio falls outside the state licensing requirement.
Violating Ohio's contractor licensing prohibition is a minor misdemeanor on a first violation and a misdemeanor of the fourth degree on subsequent violations.
Under Ohio law no person may act as or claim to be a type of contractor that Chapter 4740 licenses unless that person holds a license issued under that chapter.
In Ohio a home construction service supplier may not perform a home construction service costing twenty-five thousand dollars or more without entering into a written home construction services contract with the owner, unless the supplier and owner enter into a cost-plus contract.
Severe Weather Events in Union County
Weather puts hours on HVAC equipment. Every event that pushes temperatures to extremes sends a central AC system working harder, and that accumulated strain is what repair calls are made of in Union County.
68 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.