It is a known fact that hotel guests tend to leave lights, televisions, heating and air conditioners on while they are away from the room. Through partnering with energy management companies, the eRoomEnergy thermostat is able to address this problem and in turn, significantly lower energy costs – without the need of additional wiring in the room. When a room is occupied, the guest has control of heating and air conditioning. When the room is unoccupied, the eRoomEnergy thermostat adjusts the climate to an energy-efficient setting. When the guest opens the door to re-enter the room, the eRoomEnergy thermostat adjusts back to the original setting. By adjusting the climate up or down five to ten degrees when guests are away, the hotel will be able to take advantage of noticeable savings.