A carbon filter is an optional air-cleaning insert that uses activated charcoal to absorb odors and chemicals. It is a great addition for homes with pets, smokers, or those living in areas with high pollution. You can place these filters behind the standard Washable Air Filter in your Wall Mount unit. We offer various specialized Filters in our parts and accessories section. Regular replacement of these carbon inserts is a key part of your Preventive Maintenance. They help keep your home smelling fresh and improve the overall indoor air quality. This is another way our Heat Pump Systems provide more than just temperature control. It’s an affordable way to personalize your Multi-Zone or single-zone experience.