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Folsom
Rancho Cordova
Sacramento
Arden Arcade
Carmichael
Del Paso Heights
Elverta
Florin
Foothill Farms
Gold River
La Riviera
North Highlands
Orangevale
Rio Linda
Parkway-South Sacramento

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.