I had them service my 7 year old furnaces. They were more interested in selling me new furnaces (at $2,400 or $4,000) than they were at taking care of my existing problems. Two different technicians (during separate visits) told me I needed to replace a separate part on each furnace. Ironically, they both explained that each part "was the most expensive part in the furnace." Each visit cost me $1,000. I will try someone else in the future.