Orsan had come to our door about two years prior to us hiring them. By the time we had them in to clean our toddler had managed to put toys and an apple down the vents so it was time. They sent a young guy out to do the cleaning and he was a nice guy. They also cleaned the furnace fan and I've noticed the air flow in the house was a lot better afterwards. They had to put a couple of holes in the ducts to do the cleaning, which I guess they have to do; they patched them up but sometimes they make a whistling type noise where the air leaks out. Over all we were happy.