An air handler, or air handling unit (often abbreviated to AHU), is a device used to condition and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system. Usually, an air handler is a large metal box containing a blower, heating and/or cooling elements, filter racks or chambers, sound attenuators, and dampers. Air handlers usually connect to ductwork that distributes the conditioned air through the building, and returns it to the AHU. Sometimes AHUs discharge (supply) and admit (return) air directly to and from the space served, without ductwork.

Below is one example of an air handler with which Total Comfort A/C Systems has experience and recommends:

The AEPF's blower design includes a variable-speed direct current motor, which helps eliminate the cold blast of air upon heating start-up often associated with single-speed units. The refrigerant coil and all functional parts are covered by a 10-Year Limited Warranty. Online registration required within 60 days of installation.

Product Features
Multi-Position, Variable-Speed
Available for R-410A or R-22 Refrigerant
Low CFM for efficient fan-only operation
Up to 14 airflow settings for optimized CFM
Improved Humidity Control and Comfort
Compatible with Heat Pumps and Variable-Capacity Cooling Units
Performance Certified in Accordance with the Air Conditioning and Refrigeration Institute (ARI)