bought a furnace from these people in 2007. They told me that I would not have to worry about filters....I just had to pull out the air exchangers and wash them off.I had problems and called them...never called back. Just had a reputable furnace guy in to look at my furnace because it had stopped working. He came by the same day I called and told me I had taken 10 years off the life of the furnace because of no filters. Do not call appliance serv-all