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A contractor quoting a furnace installation in Mobile County has to account for what the equipment will run against, and that means looking past standard sizing tables. 238 severe weather events were recorded in Mobile County, Alabama between 2015 and 2024. At that rate, severe weather is a routine operating condition here, and a furnace spec that ignores local load will be wrong before the unit ever turns on. Duct layout, equipment capacity, and how the system is sealed all get decided against that backdrop. A contractor who treats those as catalog questions produces an install that fits the spec sheet and not the house.
Ductwork laid down for older heating equipment carries assumptions about airflow and load that a modern furnace does not share, and whether the existing runs can handle what a new unit pushes through them is what a contractor has to settle before anything else on a furnace job gets priced. Half the homes in Mobile County, Alabama were built in 1980 or earlier (2020-2024 ACS 5-year). That matters here because a house in that range was ducted for something, just not necessarily for what a contractor is being asked to drop in now. Where the duct layout falls short, the electrical panel is the next question.
What Gets Installed With a New Furnace
The furnace itself sits in a utility space, basement, or closet near the center of the house and burns fuel to produce heat. A heat exchanger inside the cabinet transfers that heat to the air moving through, while the blower motor pushes that warmed air out into the home. The flue pipe runs from the furnace cabinet to an exterior wall or roof to carry combustion gases out.
The air handler and blower compartment connect directly to the supply and return duct openings already cut into the cabinet. A contractor also installs the gas line connection at the furnace's valve, the condensate or drain provisions where the unit requires them, and the thermostat wiring that ties the controls to the furnace so the system responds to the home's temperature.
The drawing beside this text shows a general layout of these components, and a licensed contractor determines exactly what applies to your house and its existing setup.
Get matched in Mobile CountyMobile County, by the numbers
238 severe weather events were recorded in Mobile 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 Mobile County, Alabama were built in 1980 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesMobile County, Alabama holds 186,082 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 66.0% of the occupied homes in Mobile County, Alabama (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Furnace Installation in Mobile County, Alabama5 sourced rules and standards
What happens when a contractor comes to your home
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 Mobile 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 Mobile County
Mobile County's weather puts real demands on heating and cooling equipment, affecting how hard a furnace works and how long it lasts. That workload is local, and the right installation accounts for it.
238 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.