What is an air handler?

An air handler is the indoor portion of a heating and cooling system. It doesn't generate heat or cool air itself, but rather circulates air that's been heated or cooled by a separate unit (like a furnace, boiler, or air conditioner). Think of it as the lungs of your HVAC system.

Here's a breakdown of key information:

Key Functions:

• Circulates air: The air handler's fan pulls air from your home, pushes it through the HVAC system (where it's heated or cooled), and then distributes it back into the living spaces via a network of ducts.
• Filters air: Most air handlers contain filters that remove dust, pollen, pet dander, and other airborne particles, improving indoor air quality.
• Humidifies/Dehumidifies (in some models): Some advanced air handlers incorporate humidifiers or dehumidifiers to control the moisture level in your home.
• Heats/Cools (indirectly): As mentioned, it doesn't create the heating or cooling, but manages the distribution of the conditioned air from the furnace, heat pump, or AC unit.

Components:

• Blower motor: This powerful fan pushes the air throughout the ductwork.
• Evaporator coil (for AC systems): This coil cools the air as refrigerant passes through it.
• Condenser coil (for heat pump systems): This coil can release heat into the home (heating mode) or pull heat out of the home (cooling mode).
• Air filter: Traps airborne contaminants.
• Ducts: A network of tubes that carry conditioned air to different rooms.
• Motor control board: Regulates the speed and operation of the blower motor.
• Cabinet: The housing that encloses all the components.

Types:

• Single-stage: The blower motor runs at a single speed.
• Two-stage: The blower motor can run at two different speeds, allowing for more precise temperature control.
• Variable-speed: The blower motor speed is continuously adjustable, providing the most efficient and comfortable climate control.

Maintenance:

Regular maintenance is crucial for optimal performance and longevity. This includes:

• Changing air filters regularly: This is the most important maintenance task, typically every 1-3 months depending on the filter type and indoor conditions.
• Cleaning the coils: Dust buildup reduces efficiency.
• Inspecting the blower motor and other components: Look for any signs of wear or damage.

Understanding your air handler's functions and maintenance needs will help ensure a comfortable and efficient home environment. If you have issues, it's best to call a qualified HVAC technician.