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A furnace contractor quoting in DeKalb County has to account for what this climate regularly puts equipment through before settling on equipment specs. 165 severe weather events were recorded in DeKalb County, Georgia between 2015 and 2024. At that rate, severe weather is part of the normal operating life of any system installed here, which means duct sealing, equipment capacity, and mounting decisions all have to be made with that load in mind. A unit sized for mild conditions will run harder and short-cycle sooner. Contractors who know this area price and specify accordingly from the start.
Older ductwork was sized and routed for whatever system the house was built around, and a modern furnace does not always match those assumptions. Half the homes in DeKalb County, Georgia were built in 1984 or earlier (2020-2024 ACS 5-year). A contractor assessing a furnace installation here has to look at what the existing duct runs can actually carry before the new unit is chosen, because a mismatch between the two drives the scope of the job more than the equipment selection does. The electrical service gets the same look, since what a new furnace requires at the panel may differ from what the original wiring was run for.
What a Furnace Installation Puts in Your Home
The furnace itself sits inside the house, most often in a basement, utility room, or closet. It is the core of the system, the unit that produces heat and pushes conditioned air into the rest of the home. A flue or vent pipe runs from the unit to an exterior wall or through the roof, carrying combustion exhaust out of the living space.
The air handler components built into the furnace work alongside a thermostat mounted on a main living area wall, which is the control point a homeowner reaches every day. A contractor also accounts for the filter housing and the return-air cabinet, both of which tie the furnace to the broader system and sit at or near the unit itself.
The drawing shows a typical layout, and a licensed contractor determines what applies to your specific house.
Get matched in DeKalb CountyDeKalb County, by the numbers
165 severe weather events were recorded in DeKalb 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 DeKalb County, Georgia were built in 1984 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesDeKalb County, Georgia holds 330,830 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 58.8% of the occupied homes in DeKalb County, Georgia (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace & HVAC Installation Rules on Record for DeKalb County, Georgia4 sourced standards & codes
What the contractor does on installation day
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 DeKalb County
Georgia's climate puts real stress on heating and cooling equipment over time. How hard a furnace works depends on what the weather outside demands of it, and that demand varies by county.
165 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.