Airtron is the subcontractor for Ryan homes in the Raleigh area. They install and provide warranty service for HVAC systems installed in new Ryan homes.Over a month ago our heater's outside unit froze up during freezing weather. They stated it needed a new part and they would order it and contact us to install it when it arrived. No call, email, text or even a post it left on our door. We called more than once and our Ryan rep states they contacted them more than once. After weeks of waiting and wondering we were told that they had already completed the work and "fixed" the unit by installing the new part. Problem was, no one ever came to our home and installed anything that we are aware of and no one tried to contact us to do this work. But we were left with, well to bad for you. We say we did it and have no proof we did it but you just have to accept it.Now here we are 2 weeks after that final conversation and assurances that they had 'fixed" our unit; it is freezing again and (wait for it, I bet you wont be surprised) the unit has frozen up again! So we do what our warranty requires - we call the Airtron Raleigh office. Their after hours emergency fix is to call the Charlotte office for emergency dispatch. Ok, this is the way it worked last time so we call that office. They say they will have the on call tech call us within 45 minutes. After 45 minutes we call back - no one has bothered to try to contact us in that time. The CS tells me the on call tech called THEM back, not us, and told them that we are in the Raleigh office area and not their problem so we need to contact the Raleigh office when it opens tomorrow - that is they don't care that its freezing weather tonight and we are without a working heating system; its not their problem.Can you find a company with worse CS than this one? But I guess they don't have to care as they have a contract with Ryan homes.