Air handlers and furnaces aren't typically installed together in West Chester. If you use a furnace, you probably shouldn’t need to spend time thinking about an air handler.
Air handlers are typically paired with heat pumps and deliver airflow around your residence. Some models also offer backup heating and cooling components to assist the heat pump.
A furnace runs differently by pushing hot air into your vents, which send it throughout your residence. As furnaces depend on combustion chambers to make warmth, they don't use some of the parts you'll see in a normal air handler.