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A furnace installation in Gallia County is a local sizing question, not a catalog selection. 88 severe weather events were recorded in Gallia County, Ohio between 2015 and 2024. At that rate of severe weather events, the load a heating system faces here is steady enough that a contractor has to size for it as a standing condition. A unit selected by square footage alone, without accounting for what winters here regularly ask of the equipment, will run at or near its limit through the cold months and fall short when the demand peaks. A licensed contractor works out that real load before specifying equipment.
Ductwork laid down for the furnace of its era carries the proportions, the routing, and the static pressure assumptions of that equipment. Half the homes in Gallia County, Ohio were built in 1981 or earlier (2020-2024 ACS 5-year). A contractor pricing a new furnace in a house built that long ago has to assess whether those ducts move the air a modern unit expects, and whether the electrical service supports the load the new equipment draws. Neither question is answered by looking at the unit on the shelf.
What Gets Installed With a New Furnace
The furnace itself sits in the basement, utility room, or crawl space and is the unit that produces heat. A heat exchanger lives inside the cabinet, transferring warmth to the air that moves through the house. The burner assembly and blower motor are housed in the same cabinet, one generating the heat and the other pushing conditioned air into the supply side of the duct system.
The flue pipe runs from the furnace cabinet up and out of the house, carrying combustion gases away. The thermostat mounts on an interior wall and is the control point that tells the furnace when to fire. A filter rack sits at the air intake, and a gas line connects to the burner from the home's supply.
The drawing beside this text shows a typical layout, and a licensed contractor determines what fits the configuration of your home.
Get matched in Gallia CountyGallia County by the Numbers
88 severe weather events were recorded in Gallia 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 Gallia County, Ohio were built in 1981 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesGallia County, Ohio holds 13,464 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 74.7% of the occupied homes in Gallia County, Ohio (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Gallia County, Ohio18 codes, standards, and laws
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 Rules for Gallia 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 Gallia County
Weather patterns in this part of Ohio put real demands on heating equipment over time. How hard a furnace has to work, and how often, is a local fact first.
88 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.