W.F. Smith, Inc. has been taking care of my heating and air conditioning needs for over three years now. The last time they came out, it was just for the routine maintenance. They checked out the furnace, and put in a new filter, and also checked out the air conditioning. They are always on time, and come out when they say they will. They also call ahead to make sure that everything is still a "go." I really appreciate that. Their service people are very courteous and polite, and seem to know exactly what they are doing. They are reasonably priced, and do a great job. Which explains why I am a repeat customer.