Our goal at NIAGARA DUCT CLEANING / AEROSEAL is to earn your business. However, we do recognize you may want to shop around to compare services and prices. As a member of the NADCA, we offer you this checklist to aid in the process. The checklist is designed to help residential consumers understand NADCA’s recommendations regarding the process of HVAC cleaning. Residential consumers are advised to read and understand the information on this page before hiring an HVAC cleaning company. To keep the review process organized, place a check next to each discussion topic the contractor has addressed to your satisfaction.