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Sizing a central AC system for this area starts with an honest read of what the local climate asks of equipment year after year. 117 severe weather events were recorded in Delaware County, Ohio between 2015 and 2024. At that rate, severe weather is a routine operating condition, and a contractor who ignores it when selecting equipment capacity and specifying installation details will undersize the system for what it will actually face. Refrigerant line routing, equipment placement, and unit ratings all get weighed against a workload that shows up regularly, not occasionally.
Ductwork and electrical service sized for late-century construction tend to be compatible with the equipment a contractor is putting in now. Half the homes in Delaware County, Ohio were built in 2000 or earlier (2020-2024 ACS 5-year). That alignment matters on an installation job because it shifts where the real variables live: not in whether the house can carry a new system, but in what the existing duct layout actually delivers to each room and whether the electrical service has capacity for the load a new unit draws. A contractor who opens up the supply runs here is measuring distribution, not rescuing infrastructure.
What a Central AC Installation Covers, Piece by Piece
The outdoor condenser unit sits outside the house, usually on a concrete pad along an exterior wall, and houses the compressor and condenser coil. Inside, the air handler or furnace-mounted evaporator coil sits in a mechanical room, basement, or closet and is the indoor half of the system. These are the two main pieces a contractor puts in.
The refrigerant line set runs between the two units, passing through a small penetration in the wall, and carries the working fluid that ties the indoor and outdoor sides together. A new thermostat goes on an interior wall and gives the homeowner control over the whole system.
The drawing shows a typical layout, and a licensed contractor determines what the installation requires in your specific home.
Get matched in Delaware CountyDelaware County, Ohio, by the numbers
117 severe weather events were recorded in Delaware 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 Delaware County, Ohio were built in 2000 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesDelaware County, Ohio holds 86,269 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 78.5% of the occupied homes in Delaware County, Ohio (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards Behind Central AC Installation in Delaware County, Ohio22 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 Delaware 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 Delaware County
Weather places real demands on cooling equipment, and what happens locally shapes how hard a system has to work over its life. That load profile is a local question, which is why a contractor sizing and installing central AC here needs to account for what Delaware County actually delivers.
117 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.