Buying a new thermostat is easy. Of course, you will work to try all the options. However, we recommend that you do not throw away your old thermostat if it still works.
We naturally assume that you can enjoy your new thermostat for many years without any problems. Very occasionally, however, a product can fail. Especially with a defective thermostat in the winter, it is nice if you have a temporary back up. This is to prevent your home from getting cold.