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A furnace installation in Greene County starts with what the existing setup got wrong, and weather is rarely the answer. 39 severe weather events were recorded in Greene County, Alabama between 2015 and 2024. At that rate, severe weather is an occasional event here, not a standing condition, so a contractor assessing what size unit a home needs or how the ducting should run is weighing the structure of the house and the quality of what came before it. A system that failed here most likely failed from poor original installation or deferred maintenance, and the replacement job is priced and scoped around correcting those specifics.
Ductwork laid down for an older furnace carries assumptions about static pressure, sizing, and return-air placement that a new unit does not inherit. Half the homes in Greene County, Alabama were built in 1981 or earlier (2020-2024 ACS 5-year). A contractor sizing a furnace for a house in this county has to assess whether the existing duct system will actually move air the way the new equipment expects, and in stock this old that assessment drives the scope of the job as much as the unit selection does. A panel that was wired for the original equipment may also need evaluation before the new system can run safely. The ductwork is what gets measured first.
What Gets Installed With a New Furnace
The furnace itself sits in a utility room, basement, or closet at the center of the home's heating work. Inside the cabinet, a burner assembly ignites the fuel, a heat exchanger captures that heat, and a blower motor pushes warmed air into the supply side of the duct system. The flue pipe exits the cabinet and runs to an outside wall or up through the roof, carrying combustion gases out of the house.
A gas valve and an ignition control board mount inside the cabinet and govern when and how the burner fires. The thermostat goes on an interior wall and is the control point the homeowner touches. A contractor also sets the filter housing at the return-air inlet, which is where air enters the furnace before it passes through the heat exchanger.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to this house based on its construction, existing connections, and local code requirements.
Get matched in Greene CountyGreene County, by the numbers
39 severe weather events were recorded in Greene 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 Greene County, Alabama were built in 1981 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesGreene County, Alabama holds 4,279 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 61.6% of the occupied homes in Greene County, Alabama (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Greene County, Alabama5 codes, standards & regs
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 Greene 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 Greene County
Weather extremes put real load on heating and cooling equipment, and Greene County's climate shapes what a furnace here has to handle year after year. That workload is a local fact, and the right installation accounts for it.
39 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.