The answer to 'difference between air handler and' is an air handler and a furnace are two distinct components of an HVAC system, each serving a different purpose. An air handler is the indoor unit that circulates air throughout your home, while a furnace is responsible for heating the air. Air handlers do not generate heat, but rather move and distribute the heated or cooled air produced by the furnace or other heating/cooling equipment.
Air handlers typically contain a blower fan, air filters, and sometimes additional components like a cooling coil. Their main function is to move the air, not to generate heat. Furnaces, on the other hand, use a heat source like gas, electricity, or oil to warm the air which is then distributed by the air handler. Furnaces are the primary heating component of an HVAC system, while air handlers facilitate the airflow.