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Sizing a furnace for Clark County means accounting for what the air here actually demands of heating equipment, not just the square footage of the house. 132 severe weather events were recorded in Clark County, Indiana between 2015 and 2024. A contractor working an install in this county has to treat that weather history as a design input: a unit that runs at its limit every hard winter develops duct stress and heat exchanger fatigue faster than one with capacity to spare. Getting the load calculation and the install quality right from the start is what separates a system that holds up from one that needs attention before its time.
Ductwork laid out for a furnace generation or two removed from what a contractor installs today was designed around different static pressures and different heat outputs. Half the homes in Clark County, Indiana were built in 1982 or earlier (2020-2024 ACS 5-year). That gap between original construction and current equipment is where most of the real decisions in a Clark County furnace installation sit: whether the existing trunk lines move enough air, whether the supply and return layout matches the new unit's requirements. The electrical service is its own question, but ductwork is what gets measured first, because a mismatch there shapes everything downstream about how the system performs.
What Gets Installed With a New Furnace
The furnace itself sits in the basement, utility room, or crawl space and is the unit a homeowner will see first. Inside it, the heat exchanger and burner assembly do the core work, converting fuel to heat that warms the air moving through the system. The blower motor pushes that air out.
A flue pipe runs from the furnace to an exterior wall or roof, carrying combustion gases out of the house. The thermostat mounts on an interior wall and gives the homeowner direct control over the system. A filter housing, positioned where return air enters the furnace, keeps debris out of the equipment.
The drawing shows a general layout of these components, and a licensed contractor determines exactly what applies to your house and its setup.
Find a contractor in Clark CountyClark County, Indiana, by the numbers
132 severe weather events were recorded in Clark County, Indiana 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 Clark County, Indiana were built in 1982 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesClark County, Indiana holds 55,049 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 Clark County, Indiana (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Clark County, Indiana4 codes & standards
What HVAC Installation Looks Like in Clark County
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.
Severe Weather Events in Clark County
The stress a local climate puts on heating equipment shapes how that equipment should be selected and sized. A furnace installed in Clark County faces the same pressure swings and temperature loads recorded here, which is why local weather history is part of the installation picture.
132 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.