The answer to 'what does air handler do' is an air handler is a crucial component of a central heating, ventilation, and air conditioning (HVAC) system. It is responsible for circulating the air throughout your home, ensuring that the conditioned air (heated or cooled) is distributed evenly and efficiently.
The air handler contains a fan, which is powered by an electric motor, that draws in air from the return ducts and pushes it through the supply ducts and into the various rooms of your home. It also houses the air filter, which removes dust, dirt, and other airborne particles from the air before it is circulated. Additionally, the air handler may contain a heating element, such as an electric or gas-fired furnace, or it may be connected to a central air conditioning system to provide cooling.