Air handlers and furnaces aren't usually used in the same home in Oakville. If you have a furnace, you probably won’t need to spend time thinking about an air handler.
Air handlers are often used with heat pumps and control airflow throughout your home. Some systems also provide extra heating and cooling parts to assist the heat pump.
A furnace heats in a different way by sending hot air into your vents, which move it across your house. Because furnaces use combustion chambers to make warmth, they don't need some of the pieces you'll find in a regular air handler.