Air handlers and furnaces aren't typically found in the same home in Charlotte. If you use a furnace, you most likely won’t need to think about an air handler.
Air handlers are frequently linked with heat pumps and control airflow across your residence. Some systems also have extra heating and cooling parts to help the heat pump.
A furnace works differently by pushing warm air into your vents, which circulate it across your home. As furnaces have combustion chambers to produce heated air, they don't need some of the components you'll see in a normal air handler.