Felipe was our technician. He was methodical and professional. He was here all day cleaning. I had no idea it was going to take all day. I was very disgusted by the condition of our vent before their cleaning. Felipe found a beer can in the vents. Probably from the original construction crew. I was blown away how clean they were after Felipe was done. Their service isn't cheap, but it is well worth the investment into your home and your friends and families health. I will highly recommend ductworks.