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Sizing a furnace for this house means accounting for what Alabama winters actually ask of the equipment, not what a catalog default assumes. 55 severe weather events were recorded in Autauga County, Alabama between 2015 and 2024. At that rate, severe weather is a real but infrequent presence, which means a contractor setting specs for a new install here cannot lean on extreme load as the governing design question. What drives the sizing call instead is the construction of the house itself, duct layout, and how the existing system was set up. A contractor who gets those details wrong produces a system that runs too hard or too short every cycle, and no weather record explains that outcome.
Ductwork laid out for one generation of furnaces does not automatically carry the next one well. Half the homes in Autauga County, Alabama were built in 1994 or earlier (2020-2024 ACS 5-year). A contractor putting in a new furnace in stock of this vintage has to assess what the existing duct system will actually move, not assume it will do the job. If the distribution cannot handle the airflow the new unit requires, that becomes the first problem to solve, and it shapes the scope before the equipment selection does. The electrical is a separate check: service that was sized for older equipment may need an upgrade to meet what a modern furnace draws.
What Gets Installed With a New Furnace
The furnace itself sits inside the house, most often in a basement, utility closet, or dedicated mechanical room. It is the box that generates heat, pulling in air, warming it, and sending it back out into the living space. A flue or exhaust pipe runs from the furnace to an outside wall or through the roof to carry combustion gases out.
The air handler components built into the furnace connect to a thermostat mounted on a wall in the living area, which is the control point a homeowner touches to call for heat. A contractor also installs or ties into the supply and return connections at the furnace cabinet itself, and where a system includes a separate cooling coil, that coil sits directly above the furnace inside the air stream.
The drawing shows a general layout of these components, and a licensed contractor determines exactly what applies to your house's configuration.
Get matched in Autauga CountyAutauga County, by the numbers
55 severe weather events were recorded in Autauga 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 Autauga County, Alabama were built in 1994 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesAutauga County, Alabama holds 25,039 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 77.1% of the occupied homes in Autauga County, Alabama (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Autauga County, Alabama5 sourced standards and codes
What Happens When the Contractor Shows Up
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 Autauga 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 Autauga County
Weather conditions in this area place real demands on heating equipment, from how hard a furnace has to work to how long it holds up between service calls. The installation decisions that make sense here are shaped by local conditions, and this data is part of that picture.
55 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.