Tell us about the job
Takes about a minute. No obligation.
A contractor quoting a furnace install in Gwinnett County cannot treat sizing as a catalog exercise. 185 severe weather events were recorded in Gwinnett County, Georgia between 2015 and 2024. At that rate of severe weather, heating loads here swing harder and less predictably than a standard calculation assumes, and a unit sized without accounting for those conditions will run at the edge of its capacity when it matters most. Contractors who work this county regularly build that reality into the load calculation from the start.
Ductwork laid in a house from that era was sized for the equipment running then, and a furnace replacement does not automatically outgrow it. The electrical side is a different story. Half the homes in Gwinnett County, Georgia were built in 1996 or earlier (2020-2024 ACS 5-year). Panels from that period were rated for what those years demanded, and a new furnace with variable-speed components draws differently than what first went in. A contractor quoting the job will measure the existing circuits before pricing the unit, because the panel is where the real constraint shows up.
What a Furnace Installation Puts in Your Home
The furnace itself sits inside the house, most often in a basement, utility closet, or dedicated mechanical room. It holds the heat exchanger, the burner assembly, and the blower in a single cabinet. That cabinet is what a contractor sets in place and connects to the rest of the system.
The flue pipe runs from the furnace up and out of the house, carrying combustion gases away. The thermostat mounts on an interior wall and gives the homeowner control over when the furnace fires. Some installations also include a new air handler or coil cabinet if the home has central cooling that shares the same ductwork.
The drawing shows a typical layout, and a licensed contractor determines exactly which components apply to your house.
Get matched in Gwinnett CountyGwinnett County, by the numbers
185 severe weather events were recorded in Gwinnett 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 Gwinnett County, Georgia were built in 1996 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesGwinnett County, Georgia holds 340,962 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 66.3% of the occupied homes in Gwinnett County, Georgia (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Furnace Installation in Gwinnett County, Georgia4 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.
Severe Weather Events in Gwinnett County
Gwinnett County weather puts real demand on heating equipment, and that demand shapes what a furnace needs to handle year after year. Understanding the local pattern is part of sizing and installing equipment that holds up to this specific climate.
185 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.