What if I don't like my AirDoctor HVAC filter? Selesthe Borbon January 24, 2023 21:35 No problem, we offer a 30 Day money back guarantee (same as every other AirDoctor product). Related articles How Do You Change Filters? What is your return policy? How often do I need to replace my AirDoctor HVAC filter? What sizes are available? What particles or contaminants does the Air Doctor HVAC filter remove? Comments 0 comments Article is closed for comments.