A thermostat is a device that regulates the temperature of a system in order to maintain it at a set point temperature. This is done by releasing cooling or heating devices in order to maintain the exact temperature desired. A programmable thermostat is therefore a thermostat that adjusts the temperature in accordance to a series of pre programmed settings that take effect multiple times within a day. A programmable thermostat is also referred to as a setback or clock thermostat.
The clock thermostat is considered to be the most basic programmable thermostat available today. This is because the basic clock thermostats can only employ one program for dealing with hot and cold temperature periods. Other more advanced clock thermostats are known to allow more than four hot and cold periods throughout a day. This design is extremely easy to program as it does not allow variations through the period of a week. Some clock thermostats though have a special feature that enables one to manually change the temperature with the push of a button.
Another more popular programmable thermostat is the digital one. Digital thermostats are more versatile than the clock thermostats and generally allow four to six periods of hot and cold temperatures each day. This programmable thermostat is more convenient because it allows the user to dominate over the program during a period though automatically reassuming the initial programming when the next period begins. More advanced digital programmable thermostat models also enable holding a temperature and then release it whenever you want to. They also have a user-directed air filter change reminder in order to remind the user when it is time to change the filter. This reduces the risk of the programmable thermostat over-heating or over-cooing a device and also saves it from over usage and deterioration.
The digital programmable thermostat with PID controller is a more advanced and more expensive version of the above. The built-in PID controller ensures that the system reacts to the commands with the thermostats knowledge. Therefore instead of just working at a set time, such thermostats also know the exact temperature to switch on to. This saves a lot of effort on the consumer’s part. A commercial thermostat on the other hand is preferred to choose between hot or cold as is determined by a central regulator thereby saving time. Thereby it is essential that one makes sure that they know exactly what type of programmable thermostat fits their daily needs before making a purchase.