I have one of those most new and undoubtedly up-to-date smart control units in my house for my central heating and a/c unit. I have had this smart control unit almost 6 months or so now. And the other afternoon I observed a major issue with the smart control unit. The timer that you program for it go on and off at a particular time was off by about 10 minutes. This was a problem and not normal. I knew at this point I had to do one of 2 things. The first would be to just split my losses and go out to buy a brand new smart control unit. The other would be to call the local heating and a/c contractor to send out a certified heat and air conditioning specialist to repair the timer and programmer of the smart control unit that goes with my central heating and a/c unit. I decided to call the local heating and a/c contractor first to see how much they would charge to come out and try to repair whatever was going on with my smart control unit. And after them quoting the price I had just gave up and decided that it would be way cheaper to just go out to the store and buy a brand new smart control unit and then bring it house and reinstall it myself. This would save me hundreds of dollars compared to what the local heating and a/c contractor wanted to come out and repair my smart control unit’s programmer. It just was not worth it.