Small appliances include

• A. Central air systems
• B. Large commercial units
• C. Industrial chillers
• D. Window AC units

Answer: (D)

Understanding what counts as a small appliance in cooling contexts comes down to size and installation. Small appliances are compact, self-contained devices designed for one room or a small space and usually plug into a standard outlet. Window air conditioners fit this description: they’re compact, mount in a window, and cool a single room without needing extensive ductwork or major installation.

In contrast, central air systems, large commercial units, and industrial chillers are built to cool whole buildings or large facilities. They require ductwork, complex refrigerant or water loops, and professional installation and ongoing maintenance. Their scale and integration with the building set them apart from small appliances.

So, window AC units are the small, self-contained cooling devices, which is why they’re categorized as small appliances.