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A furnace installation in Limestone County is a local sizing decision, not a standard order. 228 severe weather events were recorded in Limestone County, Alabama between 2015 and 2024. At that rate, severe weather is a standing feature of the operating environment here, and a contractor has to account for it when selecting equipment capacity and specifying how the unit connects to the home's structure and ductwork. A furnace undersized or poorly anchored for conditions like these will run harder and wear faster than the manufacturer's ratings assume.
Ductwork laid in a house from the late nineties was designed around the equipment of that era, and a new furnace does not inherit a clean fit automatically. Half the homes in Limestone County, Alabama were built in 1998 or earlier (2020-2024 ACS 5-year). That gap between what the house was built for and what runs in it today is where a furnace installation either holds to its original scope or expands into duct modifications and electrical upgrades. A contractor has to trace what is already in the walls and attic before any equipment gets priced, because the duct layout determines whether a new unit can deliver heat the way it was rated to.
What Gets Installed With a New Furnace
The furnace itself sits in a utility room, basement, or closet and is the unit that generates heat for the house. A heat exchanger inside it warms the air that passes through, and a blower motor pushes that air out into the supply side of the duct system. The flue pipe runs from the furnace to an exterior wall or roofline and carries combustion gases out of the house.
The air handler cabinet, where the blower lives, connects directly to the return and supply ducts on either side of the furnace. A contractor also installs the thermostat on an interior wall, which is the control point the homeowner uses to set temperatures. The filter housing, positioned where return air enters the unit, holds the filter that keeps debris out of the blower and heat exchanger.
The drawing shows a general layout of these components, and a licensed contractor determines what applies to the specific configuration of your house.
Get matched in Limestone CountyLimestone County, by the numbers
228 severe weather events were recorded in Limestone 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 Limestone County, Alabama were built in 1998 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesLimestone County, Alabama holds 44,354 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 77.6% of the occupied homes in Limestone County, Alabama (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards for Furnace Installation in Limestone County, Alabama5 sourced rules and standards
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 Limestone 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 Limestone County
Weather puts a measurable load on heating and cooling equipment, and that load varies by where you live. A furnace sized and installed for the conditions in Limestone County will hold up differently than one that was not.
228 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.