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A contractor sizing or installing central AC in Union County is working with a weather record that is real but not relentless. 68 severe weather events were recorded in Union County, Ohio between 2015 and 2024. At that rate, severe weather is something equipment here meets now and then, not a standing condition that grinds through components season after season. A system that failed its first summer almost certainly has an installation or sizing problem. One that ran well for years before quitting is carrying its age, and a contractor will look there first before attributing anything to the weather.
Ductwork laid in a house from the mid-nineties was designed around the equipment of that era, and a contractor pricing a new central AC system here has to verify that what is already in the walls and ceilings will carry what the new unit needs to push through it. Half the homes in Union County, Ohio were built in 1996 or earlier (2020-2024 ACS 5-year). That spread of older stock means the sizing and routing assumptions baked into the existing duct runs are worth checking before the unit is ever ordered. Where the ducts fall short, the installation grows in scope. The electrical service gets the same look, since a panel of that vintage may not be rated for a modern condensing unit's draw.
What a Central AC Installation Covers, Part by Part
The outdoor condenser unit sits on a concrete pad beside the house and holds the compressor and condenser coil. Inside, the air handler or furnace with its evaporator coil lives in a basement, utility closet, or attic. These are the two main pieces a contractor brings in and positions before anything else connects.
The refrigerant lines run between those two units, and the thermostat goes on an interior wall where it reads the temperature of the living space. A contractor also fits the condensate drain line to carry moisture away from the evaporator coil and out of the house.
The drawing shows a typical layout, and a licensed contractor determines exactly how each piece fits the configuration of your home.
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 EstimatesCodes & Standards Governing Central AC Installation in Union County, Ohio22 sourced rules and standards
What Happens on Installation Day 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 a workload on cooling equipment that mild-climate specs never account for. What the sky does in Union County shapes what the right system needs to handle, and that makes installation choices here a local decision.
68 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.