When your smart thermostat ends up having the batteries run out, you can change them pretty easy just the same as anything that requires regular batteries in your house. However, there is a single small thing you need to be careful of. When pulling the smart thermostat from the wall mount, be careful the direction you pull the smart thermostat in and how taxing you pull the smart thermostat. If you pull too taxing you could get a wire caught and end up damaging the smart thermostat. If that happened of course you would not have a working central heating and a/c. Then you would have to call the local heating and a/c company to send out a single of their most certified heating and cooling specialists to some out and service the smart thermostat if you were lucky. In some cases when this mishap happens, you will need to buy a brand new smart thermostat because the wiring is now beyond repair. But all this can be avoided if you just be careful when you remove the smart thermostat from the mount in order to be able to respectfully change the batteries. A little extra care will go a long way, and you will enjoy the benefits of your smart thermostat for years to come. It is really easy when you feel about it, however just be careful! Care and paying attention are the key things here. A smart thermostat is the best thing that came to Heating, Ventilation and A/C technology in a while! Utilize it to your advantage.