Homeowners are told they have mold and other toxic substances in their HVAC systems – claims which are most likely false and used merely to extort money. Coupons and flyers advertising rock bottom prices on “whole house air duct cleaning” and “HVAC mold and soot removal” arrive in the mail daily for some households. If you have knowledge of a practicing “blow-and-go” air duct cleaner, contact your local Better Business Bureau to report the company.