I have a 28 year old inter therm furnace and have had four different companies come look at it and could not solve the problem . I then went on Find it Duke and was put in contact with Bell Cow HVAC out of Fayetteville NC and they sent a guy out here named Logan with 12 or 14 years of experience and he had it going in no time and it is running great now .If you need a great HVAC company then you need to contact Bell Cow , they are great people to work with .