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A contractor quoting a central AC installation in Morrow County has to size for a climate where severe weather lands occasionally, not constantly. 43 severe weather events were recorded in Morrow County, Ohio between 2015 and 2024. At that rate, the load the weather places on a system over its life is real but not the dominant variable. What drives a poor outcome here is more often an undersized unit, a duct layout that never matched the house, or maintenance that slipped. A contractor who treats this county's weather as the primary design pressure will spec for conditions that do not define most seasons here.
Ductwork laid in for equipment generations removed from what a new central AC unit draws is the first thing a contractor has to work through on a job here. Half the homes in Morrow County, Ohio were built in 1980 or earlier (2020-2024 ACS 5-year). What was routed through walls and ceilings at that time followed the specs of whatever was running then, and a new system has different static pressure requirements, different air volumes, and sometimes needs supply runs where there are none. If the existing duct layout cannot carry the load, the equipment selection happens after that problem is solved.
What a Central AC Installation Covers, Piece by Piece
The outdoor condenser unit sits on a concrete pad beside the house and holds the compressor and condenser coil, the components that do the heavy lifting. Inside, the air handler or furnace coil sits in a utility space, basement, or closet and works with the outdoor unit to move conditioned air through the home.
The refrigerant line set runs between the two units, and a new installation means running copper lines sized to the equipment. The thermostat goes on an interior wall and gives the homeowner control over the whole system. A disconnect box mounts near the outdoor unit and allows the contractor to cut power safely.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to this house.
Get matched in Morrow CountyMorrow County, by the numbers
43 severe weather events were recorded in Morrow 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 Morrow County, Ohio were built in 1980 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesMorrow County, Ohio holds 14,704 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 81.2% of the occupied homes in Morrow County, Ohio (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards Governing Central AC Installation in Morrow County, Ohio22 sourced rules and standards
What happens on installation day in Morrow 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 Morrow 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 Morrow County
Weather conditions place real demand on cooling equipment, and what happens in a given county shapes how hard a system has to work over its lifetime. That load profile is a local fact, and it bears directly on what gets installed and how it is sized.
43 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.