Knowing when to replace your thermostat isn't always obvious, but understanding what signs to look for can make it easier.

• If your thermostat is non-responsive or the screen doesn't light up, try replacing the batteries or checking the appropriate circuit breaker. If that doesn't help, it's time for a new thermostat.

• Temperatures varying from room to room could be a sign of your thermostat turning your HVAC system on or off when it isn't supposed to.

• If your system doesn't turn on or off when it should, there could be a connection issue between the thermostat and the system. Have a professional find the cause and fix it.

• The same could be said if your heating or cooling system runs constantly. Have a professional take a look so you don't waste energy heating or cooling more than needed.

• Manual thermostats make it challenging to save energy when the seasons change. Programmable or smart models make it easier to reduce energy use and keep you comfortable.

If you've noticed any of these signs, it might be time to consider replacing your thermostat. Install an ENERGY STAR®-certified smart thermostat to optimize savings and comfort.