Solar Chills now come with both "Energy Saving" and High Performance" models—you can more exactly match the cooler to your application. The new clean out pump and wind up mechanical timer make maintenance a breeze, just turn the lever and the water in the pan pumps out to your favorite plants. The customized control boxes provide a convenient place for optional thermostats, clean out timer, rheostat, pump switch, main switch, and reverse/exhaust switch. Solar panel sold separately.Like bread and butter, solar power and cooling complement each other—the more intense the sun shines, the more cooling power generates. Each gallon of water evaporated gives almost 16,000 BTU of cooling and you can evaporate 1-7 gallons each hour. You can cool down a 110° room to 75°