A method for operating a hotel management system of a hotel having a plurality of guest rooms each guest room including a plurality of devices of the hotel management system connected to each other via a respective room network and connected to a remote server of the hotel management system via a hotel network (22, 24), the method comprising: the remote server receiving data related to a guest room of the hotel, wherein the received data related to the guest room includes a guest room rental status and a guest room occupancy status; the remote server monitoring the received data related to the guest room of the hotel in order to detect the presence of each of two or more energy saving conditions associated with the guest room under which there is an opportunity to save energy when controlling the guest room without sacrificing guest comfort, wherein the two or more energy savings conditions include one or more of: the guest room rental status is un-rented; and the guest room rental status is rented and the guest room occupancy status is un-occupied; the remote server determining a measure of reliability of detecting the two or more energy savings conditions associated with the guest room based at least in part on Property Management System, PMS, connectivity parameters providing an indication of connectivity to the PMS, wherein the PMS provides the guest room rental status to the remote server, and also based on one or more room network connectivity parameters providing an indication of network connectivity to the respective room network; controlling the guest room in a designated energy savings mode when one or more of the energy savings conditions of the guest room are detected, and controlling the guest room in a guest comfort mode when none of the energy savings room conditions are detected; and the remote server determining an energy score for the guest room based at least in part on the measure of reliability of detecting the two or more energy savings conditions of the guest room, wherein the energy score is representative at least in part of the ability of the hotel management system to take advantage of the opportunity to save energy when controlling the guest room; the remote server displaying the energy score on a display (26, 34) of the hotel management system; and the remote server outputting an explanation section (158, 162, 166, 170, 174, 178) to the display (26, 34) that provides suggestions as to what and how to fix particular problems in the hotel management system to improve the ability of the hotel management system to take advantage of the opportunity to save energy when controlling the guest room. the remote server receiving data related to a guest room of the hotel, wherein the received data related to the guest room includes a guest room rental status and a guest room occupancy status; the remote server monitoring the received data related to the guest room of the hotel in order to detect the presence of each of two or more energy saving conditions associated with the guest room under which there is an opportunity to save energy when controlling the guest room without sacrificing guest comfort, wherein the two or more energy savings conditions include one or more of: the guest room rental status is un-rented; and the guest room rental status is rented and the guest room occupancy status is un-occupied; the guest room rental status is un-rented; and the guest room rental status is rented and the guest room occupancy status is un-occupied; the remote server determining a measure of reliability of detecting the two or more energy savings conditions associated with the guest room based at least in part on Property Management System, PMS, connectivity parameters providing an indication of connectivity to the PMS, wherein the PMS provides the guest room rental status to the remote server, and also based on one or more room network connectivity parameters providing an indication of network connectivity to the respective room network; controlling the guest room in a designated energy savings mode when one or more of the energy savings conditions of the guest room are detected, and controlling the guest room in a guest comfort mode when none of the energy savings room conditions are detected; and the remote server determining an energy score for the guest room based at least in part on the measure of reliability of detecting the two or more energy savings conditions of the guest room, wherein the energy score is representative at least in part of the ability of the hotel management system to take advantage of the opportunity to save energy when controlling the guest room; the remote server displaying the energy score on a display (26, 34) of the hotel management system; and the remote server outputting an explanation section (158, 162, 166, 170, 174, 178) to the display (26, 34) that provides suggestions as to what and how to fix particular problems in the hotel management system to improve the ability of the hotel management system to take advantage of the opportunity to save energy when controlling the guest room.