Many users will ignore an energy saving tips in thermostats which is hidden in the parameter setting. It’s OWD function, Open Window Detection. When thermostat detects the room temperature drop rapidly, it will shut off heating device for a certain time to save energy. The detect time , drop temperature and shut off time can be adjusted at the parameter setting. Default setting is within 15 mins, if notice room temperature drop 2 ℃, will stop heating for 30mins, then resume to normal work.   Energy saving thermostat, energy star thermostat, energy efficient thermostat,PSE&G smart thermostat, program thermostat to save money