Air handlers and furnaces aren't often installed together in Fort Wayne. If you have a furnace, you most likely don't need to consider an air handler.
Air handlers are typically paired with heat pumps and deliver airflow across your residence. Some models also provide secondary heating and cooling pieces to assist the heat pump.
A furnace runs differently by pushing warm air into your vents, which circulate it throughout your house. Because furnaces use combustion chambers to make hot air, they don't need some of the parts you'll see in a regular air handler.