A 120 volt thermostat heating and cooling system is a type of climate control system that uses a thermostat to regulate the temperature of a room or building. This type of system is powered by a 120-volt electrical circuit, which is the standard voltage used in most residential and commercial buildings. The thermostat is connected to a heating and cooling system, such as a furnace, air conditioner, or heat pump, and is used to turn the system on and off as needed to maintain the desired temperature. The thermostat can be programmed to turn the system on and off at specific times, or it can be manually adjusted to maintain the desired temperature. This type of system is an efficient and cost-effective way to maintain a comfortable indoor climate.