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A contractor quoting furnace installation here has to account for what this area regularly puts equipment through. 112 severe weather events were recorded in Franklin County, Alabama between 2015 and 2024. At that rate, severe weather is a standing feature of the operating environment, not an occasional disruption, and it shapes what sizing decisions look like. A unit that is correctly matched to local load demands, and installed with that load in mind, holds up differently than one spec'd from a catalog without it. The installation quality carries consequences here that it might not carry in quieter places.
Ductwork laid down for an older furnace was sized around that furnace's airflow, not the one going in now. Half the homes in Franklin County, Alabama were built in 1983 or earlier (2020-2024 ACS 5-year). A contractor pricing a furnace installation here has to assess whether the existing trunk lines and branch runs will carry the new unit's output without restricting it or creating pressure problems. If they cannot, the duct work becomes part of the job before the furnace is even ordered. The electrical service gets the same look, since older panels were not wired with the draws of current equipment in mind.
What Gets Installed With a New Furnace
The furnace itself sits in a utility space, basement, or closet and is the unit a homeowner sees when they look at the system directly. It holds the heat exchanger, the burner assembly, and the blower in a single cabinet. A contractor sets the cabinet in place and connects it to the fuel supply and the flue that carries combustion gases out of the house.
The flue pipe runs from the furnace cabinet to an exterior wall or roof and is the path combustion exhaust takes to leave the building. The thermostat mounts on an interior wall where it reads the air temperature and tells the furnace when to fire. A contractor also installs or ties into the drain line if the new unit is a condensing model that produces liquid as part of its operation.
The drawing shows a typical furnace layout, and a licensed contractor determines exactly what applies to your house and its existing setup.
Get matched in Franklin CountyFranklin County, Alabama, by the numbers
112 severe weather events were recorded in Franklin County, Alabama 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 Franklin County, Alabama were built in 1983 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFranklin County, Alabama holds 14,002 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 72.4% of the occupied homes in Franklin County, Alabama (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Furnace Installation in Franklin County, Alabama5 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 Rules for HVAC Work in Franklin County, Alabama
Alabama requires state certification to do heating, air conditioning and refrigeration contracting: nobody may advertise, bid, pull permits or do the work unless the person in responsible charge is a certified contractor.
Severe Weather Events in Franklin County
Weather in Franklin County puts real load on heating equipment. A furnace sized and installed for local conditions holds up better than one spec'd to a national average.
112 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.