I bought a smart thermostat and I had a major issue with it. Everything but the issue I am about to explain was fine. But the problem was that I could not get the thermostat to react to the app that was on my cell phone! This made it very hard to take advantage of all the great features of the smart thermostat. I could not program it, and most of all I could not turn it off and on manually when away from home. That is supposed to be the biggest benefit of the smart thermostat. To be able to do that helps you save a lot of money on your monthly electric bills. Having no control over that because the smart thermostat is not working with the cell phone app that controls it makes it so that you may as well just have a regular standard digital thermostat for your central heating and air conditioning system unit. That is the only way it makes any sense to have a smart thermostat is if you can access these features. I am most likely going to be getting rid of this smart thermostat and just going back to a total old school dial thermostat. Those things were really the best and really made it so that I could easily control my central heating and air conditioning system unit with no issues at all. I will probably do this in the next week or so, because I have decided that this smart thermostat is simply just not for me. I just can not get it to work right!