Auxiliary power
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Auxiliary power is electric power that is provided by an alternate source and that serves as backup for the primary power source at the station main bus or prescribed sub-bus.
Garrett Ai Research GTC85 Auxiliary Power Unit for Boeing 727 100 and 727 200 aircraft Hiller Aviation Museum San Carlos, California DSC03059
Air conditioning
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Air conditioning, often abbreviated as A/C or air con, is the process of removing heat from an enclosed space to achieve a more comfortable interior temperature and, in some cases, controlling the hum
An array of air conditioner condenser units outside a commercial office building
The István Röck factory exhibits a small home refrigerator , an air cooling device for large rooms, and a large industrial refrigerator (in the background) at the 1896 National Millennium Exhibition in Budapest
Willis Carrier, who is credited with building the first modern electrical air conditioning unit
The infrared transmitting LED on the remote