What is the definition of a non programmable thermostat? Simply put, a non programmable thermostat is a type of thermostat that does not have the ability to be programmed to adjust the temperature of a home or building automatically. This type of thermostat has been around for many years, and it is still in use today in some areas. A non programmable thermostat typically consists of a temperature knob or dial which can be adjusted manually. This requires the user to adjust the temperature manually at different times throughout the day and night. The temperature can be set to whatever the user desires, however it will remain at that same setting until changed again. Non programmable thermostats are relatively inexpensive and easy to install, making them a popular choice for many people. Although they do not offer the convenience of an automated system, they are an effective way to maintain a comfortable temperature in your home or office.