Air handlers and furnaces aren't often found in the same home in Waukegan. If you rely on a furnace, you most likely shouldn’t need to spend time thinking about an air handler.
Air handlers are typically paired with heat pumps and manage airflow throughout your residence. Some systems also provide secondary heating and cooling pieces to help the heat pump.
A furnace runs differently by sending heated air into your vents, which send it across your home. As furnaces have combustion chambers to produce heated air, they don't use some of the components you'll spot in a regular air handler.