How often should I change the Filter?

As the manufacturer of SUN AIRE products here in AMERICA including SUN AIRE purifiers, you need to know that our pre-filters on BOTH of our products- SUN AIRE purifiers and SUN AIRE Ductless Furnaces - are LIFETIME/WASHABLE. Therefore, you NEVER need to replace our pre-filter. This feature alone SAVES our customers $100-200 per YEAR in expensive HEPA/charcoal/carbon replacement filtering medium. Our products are LIFETIME- that means they will last you a lifetime with very little maintenance! MADE IN AMERICA! www.betterair.com