An air handler is a primary indoor component of a split HVAC system designed to regulate and circulate air as part of a heating or cooling system. It usually contains a blower, heating or cooling elements, filter racks or chambers, and dampers to manage airflow throughout the home. Unlike a furnace, which generates heat through combustion, an air handler works in tandem with an external condenser or heat pump to move conditioned air. These units are critical for maintaining consistent indoor temperatures and ensuring that air is properly filtered before entering your living space. If you are looking to upgrade your current indoor setup, you can find a wide variety of high-efficiency Air Handlers to match your specific outdoor unit. They are often used in all-electric setups but can be paired with various heat sources depending on the climate. Proper sizing of the air handler is essential to prevent short-cycling and to ensure the longevity of the entire system.