The central vacuuming system was in the house when I bought it twenty years ago. It always worked fine but I thought it was time to get it serviced. There was a sticker on the tank with the phone number for Advanced Homes. I think it went straight to the technician's cellphone. I was able to make an appointment directly with him for a service call and he showed up as scheduled. The technician did the necessary service and cleaning. It's nice that Advanced Homes is just a phone call away. I recommend them.