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Sizing a furnace correctly for this area and sealing the install well are not details a contractor can defer to a later visit. 62 severe weather events were recorded in Marengo County, Alabama between 2015 and 2024. At that rate, severe weather is a standing condition in this county, and a furnace that was undersized at install or fitted with gaps in the ductwork will run harder and cycle more often to compensate. That extra demand lands on the heat exchanger, the blower motor, and the control board. A contractor quoting a new installation here has to treat those conditions as load factors, not footnotes, before they can spec the right unit.
Ductwork sized for older equipment is the first thing a contractor has to account for when installing a furnace here. Half the homes in Marengo County, Alabama were built in 1982 or earlier (2020-2024 ACS 5-year). A system built for the loads that equipment placed on a house moved air at volumes and pressures that modern furnaces do not match, which means the existing duct layout determines whether the installation is straightforward or requires additional work before the new unit can run correctly. The electrical service tells a similar story. A contractor who prices the furnace without opening walls to check both is pricing the wrong job.
What Gets Installed With a New Furnace
The furnace itself sits in a utility room, basement, or closet and is the unit a homeowner would walk up to and recognize. Inside that cabinet, a burner assembly fires the heat, a heat exchanger transfers it to the moving air, and a blower motor pushes that air out into the home.
A flue pipe runs from the furnace to an exterior wall or roof and carries combustion gases out of the house. Alongside it, a filter housing mounts at the air return to catch dust before it reaches the internal components, and a thermostat on a main living-area wall ties the whole system together by telling the furnace when to run.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your house.
Get matched in Marengo CountyMarengo County, by the numbers
62 severe weather events were recorded in Marengo 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 Marengo County, Alabama were built in 1982 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesMarengo County, Alabama holds 9,867 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 70.2% of the occupied homes in Marengo County, Alabama (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Marengo County, Alabama5 codes, standards, and laws
What happens when the contractor arrives
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 Marengo 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 Marengo County
Weather puts a workload on heating and cooling equipment that varies by where you live. A furnace serving Marengo County faces whatever this climate delivers, and that shapes what the right installation looks like here.
62 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.