Air handlers and furnaces aren't often installed side by side in Knoxville. If you use a furnace, you most likely won’t need to consider an air handler.
Air handlers are frequently paired with heat pumps and deliver airflow across your residence. Some units also offer backup heating and cooling components to support the heat pump.
A furnace runs differently by pushing warm air into your vents, which send it across your home. Because furnaces depend on combustion chambers to make hot air, they don't need some of the components you'll spot in a standard air handler.