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Sizing a furnace for a Cobb County home starts with what the climate actually asks of it. 105 severe weather events were recorded in Cobb County, Georgia between 2015 and 2024. At that rate, severe weather is a recurring condition rather than an occasional event, and a contractor has to size the unit around the load this area genuinely places on it. A furnace spec'd for somewhere less demanding will run harder against Cobb County winters, and the gap between catalog sizing and local sizing shows up in how quickly the system struggles to maintain temperature on the coldest nights of the year.
Ductwork designed around equipment from a prior generation does not always carry what a new furnace demands, and that mismatch is where furnace installation work gets complicated in Cobb County. Half the homes in Cobb County, Georgia were built in 1990 or earlier (2020-2024 ACS 5-year). A contractor installing a new unit in stock like this checks the existing duct layout and its capacity before anything else, because what was adequate then may restrict airflow now. The electrical side follows the same logic. A house wired for older heating equipment sometimes needs service work before the new furnace can run at full draw.
What a Furnace Installation Covers
The furnace itself sits inside the house, most often in a basement, utility closet, or mechanical room. It is the central unit that produces heat and pushes conditioned air into the home. A new installation also includes the flue or venting pipe that runs from the furnace to an outside exhaust point, carrying combustion gases out of the living space.
The air handler components built into the furnace work alongside a thermostat mounted on an interior wall, which is the control point the homeowner uses to set temperatures. A new installation also brings in a filter housing where return air enters the unit, and in many homes a separate indoor coil is positioned above the furnace to serve the cooling side of the system.
The drawing shows a representative layout, and a licensed contractor determines exactly which components apply to this house.
Get matched in Cobb CountyCobb County, by the numbers
105 severe weather events were recorded in Cobb County, Georgia 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 Cobb County, Georgia were built in 1990 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCobb County, Georgia holds 314,104 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 67.0% of the occupied homes in Cobb County, Georgia (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules on the Books for Cobb County, Georgia4 codes, standards & laws
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.
Severe Weather Events in Cobb County
Weather puts real load on heating equipment, and Cobb County's conditions are what a furnace here has to be sized and installed for. That makes local weather history a practical reference, not background noise.
105 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.