The answer to 'how often to replace thermostat' is that most thermostats should be replaced every 5-10 years, depending on the type and usage. Programmable and smart thermostats tend to have a shorter lifespan of around 5 years, while manual thermostats can last up to 10 years with proper care and maintenance. Replacing your thermostat on a regular schedule ensures it continues to function properly and efficiently controls your HVAC system.
It's important to keep an eye on your thermostat and replace it if you notice any issues like erratic temperature readings, difficulty programming, or if it simply stops working. Upgrading to a newer, more energy-efficient model can also help lower your monthly utility bills.