The Model PLVT1 Compact Digital Programmable Thermostat that comes with a heat pump has the ability to directly control small boilers, furnace, circulation fans, air conditioner and the heat pump inside residential and commercial buildings. With the large screen display, variations in present temperature is readable and the operating mode is also seen. During power outage, the thermostat will continue to function through the use of two AAA batteries. To minimize the need of switching modes for varying seasons, the thermostat can automatically be switched between cooling and heating . Likewise, the Series LVT Digital Programmable Indoor Thermostat with heat pump regulates the temperatures inside residential and commercial establishments. To save energy, the thermostat can be set to use during weekends and weekdays. The unit has four programmable events each day which permits the building owners to have varying configurations for occupation and unoccupation times.