Air handlers and furnaces aren't often installed together in Albany. If you rely on a furnace, you probably won’t need to consider an air handler.
Air handlers are frequently linked with heat pumps and control airflow across your home. Some models also have extra heating and cooling pieces to assist the heat pump.
A furnace heats in a different manner by pushing warm air into your vents, which move it around your house. Since furnaces use combustion chambers to make warmth, they don't need some of the pieces you'll spot in a regular air handler.