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A contractor quoting a furnace installation in Shelby County has to size for what the climate actually demands, and the weather record here gives them something concrete to work from. 88 severe weather events were recorded in Shelby County, Kentucky between 2015 and 2024. At that rate, severe weather is a real factor in how hard heating equipment runs through a season, but it is not so relentless that it overrides every other sizing variable. The age of the home, duct condition, and insulation quality all stay in the calculation. A contractor who prices and sizes a furnace here against the local record will spec differently than one working from a generic load table.
Ductwork laid down for an earlier generation of equipment is what a contractor finds behind the walls of a typical Shelby County house, and whether that ductwork carries a new furnace well enough is the first question a new install raises. Half the homes in Shelby County, Kentucky were built in 1993 or earlier (2020-2024 ACS 5-year). That gap between what the house was designed around and what now runs in it is where an installation job gets complicated or stays simple. A contractor who sizes the furnace without checking whether existing runs, trunk lines, and return capacity match the new unit's airflow requirements will get the equipment choice right and the install wrong.
What Gets Installed With a New Furnace
The furnace itself sits inside the house, most often in a basement, utility closet, or mechanical room. It is the box that produces heat. Mounted on or near it, the air handler moves conditioned air into the duct system that feeds the rest of the house.
The thermostat goes on a main-floor wall where it reads the temperature of the living space and tells the furnace when to fire. A flue or exhaust vent runs from the furnace to an outside wall or through the roof, carrying combustion gases out of the house.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to this house.
Get matched in Shelby CountyShelby County, by the numbers
88 severe weather events were recorded in Shelby County, Kentucky 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 Shelby County, Kentucky were built in 1993 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesShelby County, Kentucky holds 19,531 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 73.9% of the occupied homes in Shelby County, Kentucky (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards for Furnace Work in Shelby County, Kentucky5 sourced rules and 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 Shelby County, Kentucky
Kentucky requires a licence to practise heating, ventilation and air conditioning contracting: a person may not do the work unless they have met the state licensing requirements.
Severe Weather Events in Shelby County
Shelby County weather puts real demands on heating equipment over time. How hard a furnace works, and how often, depends on what the climate around it actually does.
88 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.