This is my second time using Ductworks, and I couldn't be more pleased. My technician Jul was here for almost 7 hours, and did a very comprehensive job, thoroughly cleaning every vent and return duct. The before and after pictures he showed me told the story. After several years of construction in my basement and kitchen, the ducts were covered with sheetrock and wood dust. After Jul finished cleaning you could actually see the shine on the inside of the ducts again. He even disassembled and cleaned the fan inside my furnace. Truly outstanding job!!