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A contractor sizing a furnace for a Florence County home has to treat the load calculation as a local question, not a default one. Homes in Florence County, SC run heat about five months a year, from November through March. The burner and heat exchanger cycle through that whole stretch without meaningful rest, and a unit that was sized too small runs longer per call, stressing the ignition system and the heat exchanger in ways that compound each season. Get the sizing wrong at install and the equipment shows it faster here than it would somewhere the furnace sits off most of the year.
Ductwork laid out for a furnace that no longer exists in the house shapes what a contractor has to work with before the new unit arrives. Half the homes in Florence County, South Carolina were built in 1986 or earlier (2020-2024 ACS 5-year). A system installed into that stock gets sized to the house, but it also gets reconciled to trunks and branches that were cut and fitted around something different. If those runs carry the new unit's airflow without modification, the job stays contained. If they do not, the contractor recuts before the furnace ever fires. The electrical service gets the same check, because what the panel was set up to handle and what a new furnace draws are separate questions.
What Gets Installed With a New Furnace
The furnace itself sits inside the house, almost always in a basement, utility closet, or dedicated mechanical room. It is the box that generates the heat. Attached to it is the flue, which runs up through or along an exterior wall and carries combustion gases out of the house.
The air handler and blower components work alongside the furnace to push conditioned air into the duct system. The thermostat mounts on an interior wall and serves as the control point for the whole system, telling the furnace when to fire and when to stop.
The drawing here shows a typical layout, and a licensed contractor will determine what the configuration looks like in your specific home.
Get matched in Florence CountyFlorence County, by the numbers
120 severe weather events were recorded in Florence County, South Carolina 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 Florence County, South Carolina were built in 1986 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFlorence County, South Carolina holds 62,090 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 64.5% of the occupied homes in Florence County, South Carolina (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules on the Books for Florence County, South Carolina5 codes, standards, and licensing rules
What Happens When the Contractor Comes Out
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 and Legal Requirements in Florence County, South Carolina
South Carolina requires a mechanical contractor license for contracting work whose total cost of construction is greater than ten thousand dollars.
Severe Weather in Florence County
Weather puts a measurable load on heating equipment, and that load varies by location. What Florence County sees year to year shapes how hard a furnace has to work and how well it has to be sized.
120 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.