How does an air handler differ from a furnace?

An air handler is primarily responsible for circulating air throughout a building or space, often in conjunction with an air conditioning system or a heat pump. It includes components like fans and filters that help to move air effectively while ensuring that it passes through any necessary filtration or treatment processes.

In contrast, a furnace is specifically designed to generate heat. When activated, it combusts fuel (such as natural gas or propane) or uses electrical resistance to produce heat, which is then distributed throughout the space via a network of ducts. Thus, the main distinction is that the air handler focuses on the movement and distribution of air, whereas the furnace is concerned with heat generation.

Understanding this difference helps in correctly identifying the roles of various components in HVAC systems, ensuring proper selection, installation, and maintenance of heating and cooling equipment.