The Lifesmart indoor/outdoor coolers are almost perfect for camping. It is an evaporative cooler so your tent does not need to be insulated to keep cool, but rather have open ports to keep cool air flowing. A gallon of water delivers up to 10 hours of run time for the unit and it uses less energy than a 40w light bulb. The 350CFM airflow will keep an area of up to 250sq m cool. Its stands 21 inches tall and weighs 10 pounds and has an inbuilt carry handle.