In colder months many use portable heaters for comfort. We also use them by turning down the thermostat and use the portable units to keep one room warm and save money. Not a bad idea. Now you can use a device to cool and room in the summer. It is not a portable air conditioner but rather an evaporative cooling unit. They are portable and can be moved from room to room or even used outside on a deck or screen porch. If you are familiar with a swamp cooler this is the technology. Small light weight and use where needed. It can drop the temperature in a room or outdoors by 15 degrees. Perfect for an upstairs of a home that is just too hot.