The thermostat market is expected to grow rapidly in the future. That is because demand for energy-efficient HVAC solutions accelerates and sales of various smart home devices increase rapidly. Efficient energy savings, smart control, and reduced unit energy costs are key parameters that drive industry growth in the future. In addition, what is required for future thermostats is not just HVAC control, but also small and many functions are operated for a long time, such as dimming the smart lights to create a dinner party's atmosphere or activating your favorite digital playlist from any room in the house with sound. To achieve this, it is essential to reduce the power consumption of the various circuits and to reduce the size of the components installed. It is also essential to extend the service life in constant operation, as the system is constantly operating and, once it becomes unusable, will seriously interfere with our lives. The use of Toshiba's advanced, high-performance power management ICs helps to reduce current consumption in the active and sleep states and extend the life of the entire system. In addition to these power-management ICs, Toshiba will continue to contribute to technological innovations in future thermostats by offering high-performance discrete products such as photocouplers with isolation functions to protect the thermostats from the noises that HVAC systems constantly generate.