I have a pretty new heating and air conditioning system in my home. I spent a lot of money on it as well. For the last four or five months it has worked pretty well, until recently. Recently I had discovered a major problem with the air flow of the heating and air conditioning system. My hallway for some reason was getting a bunch of heat pumped into it! I have actually had the air conditioning on a bit lately as it has been a little hot outside. Why my hallway was getting heating instead of cooling was beyond me. I knew there may have been something wrong here. This is when I called the heating and cooling company that installed the HVAC unit. I told them what was going on. Then, they looked at my history and told me that I had heating and cooling zone control. I did not even understand what they meant! They went on to explain, that the system I got can make different areas of the home different temperatures. After this, I then noticed that I had an additional thermostat on the wall of the hallway! That thermostat was not even on at all. This was why it appeared that I was getting heating in the hallway. I thanked the heating and air conditioning company for actually explaining all of this to me. I felt like a real idiot to be honest. But, at that point, I flipped on the thermostat in the hallway, and now it was cooling off. I will not make that error in judgement again!