Air Handler
An air handler is the indoor component of an HVAC system that circulates conditioned air throughout a building via ductwork. It contains the blower motor, air filter, and evaporator coil that work together to distribute heated or cooled air to every room.
An air handler is the central indoor unit of a heating, ventilation, and air conditioning (HVAC) system responsible for moving conditioned air through your home’s ductwork. This large metal cabinet houses the mechanical components that push heated or cooled air into your living spaces and pull return air back for reconditioning.
Primary Components
The air handler contains several key parts that work together to maintain comfortable indoor temperatures:
- Blower Motor and Fan: Creates the airflow needed to push air through the duct system, typically moving thousands of cubic feet per minute
- Evaporator Coil: Cools and dehumidifies air during air conditioning operation by absorbing heat from indoor air
- Air Filter: Captures dust, pollen, and other airborne particles before they circulate through your home
- Heating Elements: Some units include electric heating strips or connect to a furnace for warming air
- Drain Pan: Collects condensation that forms on the evaporator coil during cooling cycles
How It Functions
During operation, the air handler pulls air from your living spaces through return ducts. This air passes through the filter, removing contaminants, then moves across the evaporator coil where it’s cooled or heated depending on your thermostat settings. The blower motor then pushes this conditioned air through supply ducts to registers throughout your home.
Location and Installation
Air handlers are typically installed in attics, basements, closets, or utility rooms. The unit connects directly to your ductwork and requires electrical power to operate. In split HVAC systems, the air handler works in tandem with an outdoor condensing unit that handles heat exchange with outside air.
Maintenance Considerations
Regular air handler maintenance helps prevent system failures and maintains air quality. Technicians inspect the blower motor, clean the evaporator coil, check drain lines for clogs, and verify proper airflow during routine service visits. Homeowners should replace air filters every 1-3 months depending on usage and environmental factors. When professional duct cleaning occurs, technicians pay special attention to the air handler since it serves as the distribution point for all circulated air.
Performance Impact
A properly functioning air handler directly affects your HVAC system’s efficiency and your home’s comfort level. Restricted airflow from dirty components forces the system to work harder, increasing energy costs and reducing equipment lifespan. Clean ducts and a well-maintained air handler allow for better air circulation, more consistent temperatures, and improved indoor air quality throughout your home.
