Air cleaners can be used year-round. They are useful for removing mold during times of high humidity and removing dust during drier seasons, and they clean year-round air impurities such as animal dander.
Homeowners can use air cleaners in conjunction with heating and cooling systems or alone, when the HVAC is not in use. Regularly cleaning and replacing air filters in the HVAC system and using it alongside an air cleaner ensures the purest air possible inside the home. Regular mold testing in high humidity areas and using a vacuum cleaner designed to filter dust and allergens are other ways to keep air clean.