Our clothes dryer wasn’t working too well, and we learned the problem was with a clogged duct (about 20′ long in the crawlspace). Don evaluated the duct and taped up some leaky joints, then cleaned it thoroughly. The house is 22 years old and he said the duct had probably never been cleaned. We’re lucky we didn’t have a fire. Don was friendly, efficient and extremely helpful. The price was quite reasonable. Couldn’t ask for more.