There are a number of components to your HVAC systems that you have very little interaction with. However, your thermostat is not one of them. This device controls your entire heating system or cooling system, and essentially serves as its “brain.” Therefore, you need your thermostat to function as it should.
This is why we suggest that you change the batteries in your thermostat on a yearly basis. The last thing you want to do is wake up to discover your HVAC system has failed, when the problem is as simple as dead batteries, which you may not have on hand.