When your smart temperature control ends up having the batteries run out, you can change them pretty simple just the same as anything that requires official batteries in your house. However, there is 1 small thing you need to be careful of. When pulling the smart temperature control from the wall mount, be careful the direction you pull the smart temperature control in plus how hard you pull the smart temperature control. If you pull too hard you could get a wire caught plus end up damaging the smart temperature control. If that happened of course you would not have a working central heating plus A/C unit. Then you would have to call the local heating plus A/C business to send out 1 of their most certified heating plus cooling specialists to some out plus maintenance the smart temperature control if you were lucky. In some cases when this mishap happens, you will need to buy a brand new smart temperature control because the wiring is now beyond repair. But all this can be avoided if you just be careful when you remove the smart temperature control from the mount in order to be able to properly change the batteries. A little extra care will go a long way, plus you will enjoy the benefits of your smart temperature control for years to come. It is entirely simple when you assume about it… Just be careful! Care plus paying attention are the key things here. A smart temperature control is the best thing that came to Heating and A/C technology in a while. Utilize it to your advantage.