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Sizing central AC for a house in Pickaway County starts with the structure: its insulation, its orientation, its square footage. 94 severe weather events were recorded in Pickaway County, Ohio between 2015 and 2024. At roughly the national midpoint for severe weather, this county does not hand a contractor a punishing climate to design around. What the contractor has to establish instead is what the house itself demands, because that is what will determine whether a system runs efficiently or short-cycles from the first season. A correctly sized install in a county like this one lives or dies on the quality of the load calculation, not on weather assumptions.
Ductwork designed for an older heating system carries assumptions about airflow, trunk sizing, and return placement that a modern central AC unit does not share. Half the homes in Pickaway County, Ohio were built in 1978 or earlier (2020-2024 ACS 5-year). That means a contractor quoting a new system has to evaluate the existing duct runs before pricing the job, because what looks like a straightforward equipment swap can require rebalancing or rerouting to get the new unit performing to spec. The electrical service gets the same look: panel capacity and existing wiring are checked against what the new equipment draws before the job is scoped.
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-mounted evaporator coil sits in a utility space, basement, or closet and is the point where the refrigerant line from outdoors meets the air your ducts will carry. A contractor installs both units and runs the copper refrigerant line that connects them.
The thermostat goes on an interior wall where it reads the temperature of your living space and tells the system when to run. A disconnect box mounts on the exterior wall near the condenser, giving the contractor a local shutoff point for safe service access. Both pieces are part of what a full installation puts in place.
The drawing shows how these components relate in a typical layout, and a licensed contractor determines exactly how they come together in your home.
Get matched in Pickaway CountyPickaway County, by the numbers
94 severe weather events were recorded in Pickaway 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 Pickaway County, Ohio were built in 1978 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesPickaway County, Ohio holds 22,981 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 74.0% of the occupied homes in Pickaway County, Ohio (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Behind Central AC Installation in Pickaway 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 Pickaway 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 Pickaway County
Pickaway County weather puts real demand on cooling equipment over time. How hard a system works and how long it holds up depends on local conditions, which is why the record below matters for anyone sizing or installing central AC here.
94 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.