My buddies from college all got together for a long weekend. We drank, reminisced and hung out on the beach for a few days. Since there were so many of us we rented a condo to house us all. The condo was super great. It was huge with all modern appliances. The HVAC unit was really neat too. There were thermostats in each of the bedrooms of the large condo. My buddy Shane said that meant the condo had HVAC zone control. We could each change the heating and cooling settings in our own room. Then these temperature control settings would not affect the other rooms. Each thermostat was linked to an indoor air handler that ran by itself. We were all amazed by Shane’s knowledge and by the zoned heating and cooling. So for the long weekend we all adjusted our thermostats at night. I kept noticing that no matter what I switched my thermostat too, it would then go to a new temperature. Sometimes it was a low temperature where the AC came on and then sometimes it was super high where I was sweating to death. It seemed like the thermostat controlled itself. I then talked to everyone after our weekend was up about it. We then realized that the condo did not have HVAC zone control, just a thermostat in each room. So we were all adjusting the climate control and affecting one another. That is why the thermostat settings kept changing. We all had fun picking on Shane about not knowing the difference between an air handler and a thermostat.