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Sizing a central AC system in Logan County starts with the house, not the forecast. 84 severe weather events were recorded in Logan County, Ohio between 2015 and 2024. At that rate, severe weather is an occasional factor rather than a constant pressure on equipment, which means a contractor quoting an install here focuses on the structure: square footage, insulation, window placement, and how well the duct system can actually carry the load. A unit that is undersized or poorly sealed will underperform regardless of what the sky does, and those are the variables a contractor establishes before any equipment gets specified.
Ductwork laid down for one generation of equipment does not automatically carry the next. Half the homes in Logan County, Ohio were built in 1973 or earlier (2020-2024 ACS 5-year). That gap between when the house was built and what a contractor installs now is where the real sizing question sits: whether the existing runs, returns, and connections move enough air for a current central AC system, or whether they need to be corrected before the new unit performs as it should. The electrical service gets the same look, since the draw of modern equipment does not always match what the original panel was set up for.
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 lives in a utility space, basement, or closet and is the indoor half of the system. These two pieces are what a contractor sources, positions, and connects when a new central AC goes in.
A refrigerant line set runs between the indoor and outdoor units, carrying the refrigerant that links both sides into a single working system. The thermostat mounts on an interior wall and gives the homeowner a way to control the whole thing. Both the line set and the thermostat are part of what a contractor accounts for on a new installation.
The drawing shows a typical layout, and a licensed contractor determines what the configuration looks like in your specific home.
Get matched in Logan CountyLogan County, by the numbers
84 severe weather events were recorded in Logan 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 Logan County, Ohio were built in 1973 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesLogan County, Ohio holds 23,866 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 77.6% of the occupied homes in Logan 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 Logan 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 Logan 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 History in Logan County
Extreme weather puts real load on HVAC equipment, and Logan County sees the kind of variable conditions that wear systems down over time. Sizing and installing central AC for this area means accounting for what the climate actually does here, not what a generic spec sheet assumes.
84 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.