Air handlers and furnaces aren't often found together in Edmonton. If you have a furnace, you most likely shouldn’t need to spend time thinking about an air handler.
Air handlers are often paired with heat pumps and control airflow around your residence. Some systems also provide extra heating and cooling parts to support the heat pump.
A furnace works in a different manner by blowing heated air into your vents, which send it throughout your residence. Since furnaces rely on combustion chambers to produce heated air, they don't use some of the parts you'll spot in a standard air handler.