Air handlers and furnaces aren't often used in the same home in Daytona Beach. If you use a furnace, you most likely won’t need to consider an air handler.
Air handlers are usually paired with heat pumps and manage airflow throughout your home. Some units also have secondary heating and cooling pieces to support the heat pump.
A furnace runs differently by pushing hot air into your vents, which send it around your home. Since furnaces depend on combustion chambers to create warmth, they don't use some of the parts you'll find in a regular air handler.