For best results, Perfect Pollucon Services recommends to use air purifier continuously. To maintain balance between air quality and electricity/noise Air purifiers for home comes with different cleaning speeds. E.g. when you are away from home you can set it to lowest speed and when you are using it in night use it at medium speed. It will save energy and cost while maintaining indoor air quality. You can keep air purifier on minutes before going to sleep in your bedroom as it will improve quality of your sleep.