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A contractor quoting a furnace installation in Delaware County has to size for what the local climate puts on the equipment, and that is not a guess derived from a national chart. 117 severe weather events were recorded in Delaware County, Ohio between 2015 and 2024. At that rate, severe weather is a standing operating condition rather than an occasional interruption, which means the load assumptions baked into a catalog recommendation may fall short of what a system here will actually run against. A contractor who sizes from local conditions rather than regional averages produces an install that fits the house and the climate both.
Ductwork sized and installed for a house built around the turn of this century was designed to move roughly the volume a modern forced-air furnace expects. Half the homes in Delaware County, Ohio were built in 2000 or earlier (2020-2024 ACS 5-year). That means a contractor quoting a furnace replacement here is less likely to find that the existing duct runs are the problem, and more likely to be pricing the unit itself rather than a duct rebuild alongside it. The electrical picture is similar: panels in houses of that vintage were not sized for an earlier generation of equipment and then patched over decades. What a contractor opens here is more often adequate than not.
What Gets Installed With a New Furnace
The furnace itself sits in a basement, utility room, or closet and is the unit a homeowner is most likely to have seen before. Inside it, the heat exchanger and burner assembly do the core work, and the blower motor pulls air across the exchanger and pushes it into the supply side of the home.
The flue pipe runs from the furnace to an exterior wall or chimney and carries combustion gases out of the house. Alongside it, the thermostat mounts on an interior wall and serves as the control point, telling the furnace when to fire and when to stop.
The drawing shows a general layout of these components, and a licensed contractor determines what applies to the specific configuration of your house.
Find a contractor 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 EstimatesFurnace Installation Rules on the Books for Delaware County, Ohio18 codes & standards
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 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 in Delaware County puts real demands on heating and cooling equipment over time. A furnace or air handler sized and installed for local conditions holds up better than one that was not.
117 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.