For best results, it is recommended to continuously run your air filtration system as humans, pets, cooling, and heating systems, as well as open windows, constantly introduce new contaminants into the room. To help with noise and electricity costs, most systems come with multiple cleaning speeds. For example, to maintain your indoor air quality while you are away from home it can be in a lower setting than when you are home. This saves energy and cuts costs while still maintaining a clean environment.