Air handlers and furnaces aren't typically used in the same home in Orlando. If you use a furnace, you most likely won’t need to spend time thinking about an air handler.
Air handlers are frequently paired with heat pumps and manage airflow around your residence. Some models also have backup heating and cooling components to assist the heat pump.
A furnace runs in a different manner by sending hot air into your vents, which circulate it around your residence. As furnaces have combustion chambers to produce heat, they don't have some of the parts you'll spot in a regular air handler.