Building automation is the automatic centralized control of a building’s heating, ventilation and air conditioning, lighting and other systems through a building management system or building automation system (BAS). The objectives of building automation are improved occupant …

An air handler, or air handling unit (often abbreviated to AHU), is a device used to regulate and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system. An air handler is usually a large metal box containing a blower, heating or cooling eleme…

Preventive maintenance (PM)  is “a routine for periodically inspecting” with the goal of “noticing small problems and fixing them before major ones develop.” Ideally, “nothing breaks down. The main goal behind PM is for the equipment to make it from one planned service to the ne…