Digital thermostats use a simple device called a thermistor to measure temperature. This is a resistor which allows electrical resistance changes with temperature. The microcontroller in a digital thermostat can measure the resistance and convert that number to an actual temperature reading. How does a thermostat sense the temperature and know when to open and close? It's not magic. Instead, the thermostat has a wax-filled cylinder on its side. As the engine temperature rises, the wax expands and steadily pushes on a rod that opens the thermostat, allowing coolant to flow. When the engine temperature drops, the wax begins to harden With the Nest app. Choose the thermostat that you want to adjust. Select Schedule . Pick a day to add a new temperature or change an existing one. To add a new temperature, tap Add, then pick a time to add a new temperature. To change an existing one, tap and hold on a temperature. Slide up or down to change the temperature, and slide left or The changeover feature (also referred to as Changeover) allows your thermostat to automatically switch from heating to cooling, or vice versa, depending on the temperature in your home. The thermostat has a mandatory 1.5° differential or "swing", so even if you set your thermostat heating temp to 70° and the cooling temp to 70° and turn Thermistors are very simple to wire. Most come with two-wire connectors. The same two wires that connect the thermistor to its excitation source can be used to measure the voltage across the thermistor. A thermistor is a temperature sensor which exhibits a large change in resistance proportional to a change in temperature. The thermostat connected to your HVAC system is essentially the brain of that system. It allows you to choose when the system turns on, and the exact temperature of your home at various parts of the day. Many homeowners have called us for HVAC repairs when in actuality, it's not the HVAC system that has a problem at all. cU4jb.

how do thermostats sense temperature