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Sizing a furnace in Logan County starts with what the equipment will actually be asked to carry. 84 severe weather events were recorded in Logan County, Ohio between 2015 and 2024. At that rate, severe weather is a steady background pressure on heating systems rather than an occasional spike, and a contractor who ignores it risks undersizing a unit that will run hard to keep up. What that means on a quote is that duct layout, heat loss calculations, and equipment capacity all get worked out against local conditions rather than pulled from a standard table.
Ductwork sized and routed for older equipment is what a contractor meets in a large share of Logan County homes, and whether it carries a modern furnace without modification is the question that shapes the scope and the price of the job before the unit itself is even selected. Half the homes in Logan County, Ohio were built in 1973 or earlier (2020-2024 ACS 5-year). Furnaces built for today's efficiency standards move air differently than what those ducts were designed for, which means a contractor has to assess the existing system, not just the opening in the floor or wall where the old unit sat. The electrical side gets the same check: service capacity and circuit configuration follow the house's age as much as its layout does.
What Gets Installed With a New Furnace
The furnace itself sits in the basement, utility room, or crawl space and is the heart of what a contractor puts in. It houses the heat exchanger, the burner assembly, and the blower motor, all inside one cabinet. Each of those components is new when the furnace is new.
The flue pipe runs from the furnace up and out of the house, carrying combustion gases outside. Alongside the furnace, a contractor also installs the thermostat on an interior wall, which is the control point the household uses every day. The gas line connection at the unit and the condensate drain, on high-efficiency models, are handled at the same time.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your house and its existing setup.
Get matched in Logan CountyLogan County, Ohio, 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 EstimatesFurnace Installation Rules & Codes for Logan County, Ohio18 sourced standards and regulations
What the Installation Actually Looks Like
Non-weatherized gas furnaces manufactured on or after November 19, 2015 must reach 80.0 percent AFUE.
Non-weatherized oil-fired furnaces manufactured on or after November 19, 2015 must reach 83.0 percent AFUE.
Mobile home gas furnaces manufactured on or after November 19, 2015 must reach 80.0 percent AFUE.
Non-weatherized gas furnaces manufactured on or after December 18, 2028 must reach 95.0 percent AFUE, up from the 80.0 percent minimum that applies to units manufactured before that date.
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 Events in Logan County
Weather puts load on heating equipment in ways that vary sharply by location. How hard a furnace works over its life depends on what the climate around it actually does, which is why local storm history is part of the picture for any installation decision here.
84 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.