A programmable thermostat is a digital device designed to help you maintain an optimal temperature in your commercial or residential HVACHVAC system. By allowing you to pre-set temperatures at different times during the day, and have the thermostat automatically adjust as needed, this device gives you more control over your heating and cooling needs while helping you save on energy costs. It also helps prevent extreme temperature fluctuations that can cause damage to your system over time. By utilizing a programmable thermostat, you can easily monitor and adjust your indoor climate all year round while ensuring maximum comfort and efficiency.