If you want to save energy when using evaporative air coolers then you can conserve more electricity when they are operational. During the night time, you might not want the air cooler to run at its full capacity. So you could lower down the speed of the fan once the room is cooled. Placement if the air cooler unit also plays a vital role in the energy efficiency. It will take a lot more time to cool up the entire room and this will make it consume more electricity than required. For more information, visit our website http://www.sunnycooler.in/ or call us at +91731 – 2533099.