Air handlers and furnaces aren't usually used side by side in Elkhart. If you have a furnace, you probably shouldn’t need to think about an air handler.
Air handlers are frequently used with heat pumps and deliver airflow throughout your residence. Some units also provide backup heating and cooling pieces to support the heat pump.
A furnace runs in a different way by blowing warm air into your vents, which send it throughout your home. As furnaces rely on combustion chambers to create heat, they don't have some of the parts you'll find in a standard air handler.