You re a busy person with numerous devices to remember how to use. But with its familiar Honeywell Home Round design and enlarged scale making it easy to see, the CT87 Round Non-Programmable Thermostat is not one of them. It s the world s most popular thermostat design and will fit perfectly in your lifestyle and your home. The Round Manual thermostat is the world s most popular thermostat. With its familiar circular design and simple twist action, The Round Non-Programmable Thermostat makes setting your ideal temperature quick and easy. This heat-only model provides accurate performance with the ease of use that you ve grown accustomed to simply turn the dial to the desired temperature and let the thermostat take over.