I asked for several quotes before booking with Ozone Duct Cleaning. While they were a bit more expensive, the quote referred to several hours of work, no hidden costs, no cutting corners. Other estimates were for 1.5 to 2 hours of work and extra per vent, extra for for crawl space work etc. Todd answered all of my questions prior to booking and made every effort to work with my schedule. I couldn't be more pleased. He was at our home for 4 hours, explained every step, answered all my queries, updated us on an issue with our humidifier, took his time to ensure everything was clean and back in place. Worth every penny. Don't second guess if you book with him.