How often should you change your air filters? Ever wonder that? Clean air filters in your HVAC (Heating Ventilation and Air Conditioning) means greater efficiency. It also means healthy lungs when you’re not breathing bacteria from sickness and airborne pathogens. We Ask a House Cleaner about the types of air filters and should we buy fiberglass, HEPA or pleated cloth filters. Angela Brown, The House Cleaning Guru doesn’t talk about MERV rating. (You’ll find that in the show notes.) But she does give tips on dust, dust mites, allergens, and mold.