A thermostat is a component which senses the temperature of a physical system and performs actions so that the system’s temperature is maintained near a desired set-point. Thermostats are used in any device or system that heats or cools to a set-point temperature, examples include building heating, central heating, air conditioners, HVAC systems, water heaters, as well as kitchen equipment including ovens and refrigerators.
Smart thermostats are devices that can be used with home automation and are responsible for controlling a home’s heating and/or air conditioning. They perform the same functions as a Programmable thermostat as they allow the user to control the temperature of their home throughout the day using a schedule, such as setting a different temperature at night. Like a connected thermostat, they are connected to the Internet. They allow users to adjust heating settings from other internet-connected devices, such as smartphones. This allows users to easily adjust the temperature remotely. This ease of use is essential for ensuring energy savings: studies have shown that households with programmable thermostats actually have higher energy consumption than those with simple thermostats, because residents program them incorrectly or disable them completely.