Every component associated with the heating and cooling system has a lifespan.
Most of these components will fail when this period encroaches or when it exceeds.
You will notice that you have to constantly repair a specific aspect of your AC or furnace when it wears out. The thermostat, for example, is a primary culprit of breakdowns. More often than not, thermostats will start to show the wrong readings. They may suddenly register a reading that is not either by exceeding or underreporting the actual state. This can be misleading and may even trigger high energy bills. You will never know when to turn up or down, which can be risky when dealing with an HVAC system. In such a case, upgrading the thermostat by getting a new compatible one is advisable. If you can, consider buying a smart thermostat that you can control remotely. However, before investing in a new thermostat, call your HVAC technician to check and verify that it is not the problem you need to deal with. Find out if there are other reasons why it is failing. Sometimes it only requires professional cleaning to dislodge any dirt hindering its proper sensing abilities hence affecting its effectiveness. Besides that, you also need to look into the possibilities of dead batteries. Try to replace the batteries first before dismissing or writing off your current thermostat. It is also good to check whether the thermostat has any loose wires that affect the connection. A professional HVAC technician can handle all these. The bottom line is to ensure that your thermostat is not fully operational before replacing it.