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A contractor quoting furnace installation in Dallas County works out the building's heat load before anything else, because the install has to fit the structure, not a general assumption about local conditions. 48 severe weather events were recorded in Dallas County, Alabama between 2015 and 2024. At that rate, severe weather is a real but infrequent presence, not a constant operating condition, so it does not drive the sizing decision on its own. What drives it is the square footage, the insulation quality, and how the house holds or loses heat. A contractor who skips that assessment and selects equipment by region alone will put the wrong furnace in a correctly built house.
Ductwork laid down for older furnace generations carries different static pressure requirements than what a contractor is dropping in today, and the gap between what the house was built for and what now runs in it is where a furnace installation either straightens out or gets complicated. Half the homes in Dallas County, Alabama were built in 1977 or earlier (2020-2024 ACS 5-year). That spread matters most during installation because a contractor sizing new equipment to this stock has to check whether the existing duct system will actually move the air a modern furnace produces, before the unit itself is ever priced or ordered. If the ducts cannot carry it, the job changes.
What Gets Installed With a New Furnace
The furnace itself sits in a utility room, basement, or closet and is the unit that produces heat for the house. A heat exchanger lives inside it, separating combustion gases from the air that moves through your home. The flue pipe runs from the furnace to the exterior, carrying exhaust out of the building.
The air handler or blower assembly sits within or directly beside the furnace cabinet and pushes conditioned air into the supply side of the duct system. A contractor also installs the thermostat on an interior wall, which is the control point that tells the furnace when to fire and when to stop.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your home and its existing setup.
Get matched in Dallas CountyDallas County, Alabama, by the numbers
48 severe weather events were recorded in Dallas 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 Dallas County, Alabama were built in 1977 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesDallas County, Alabama holds 18,936 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 63.8% of the occupied homes in Dallas County, Alabama (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Dallas County, Alabama5 codes, standards, and licensing rules
What the Installation Looks Like in Dallas 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.
Licensing Rules for Dallas 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 Dallas County
Weather puts a cumulative load on heating and cooling equipment that flat specs and manufacturer ratings never account for. A furnace sized and installed for what Dallas County actually delivers outdoors will perform differently from one spec'd to a national average.
48 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.