energy saving temperature and humidity sensing and control processes , system and apparatuses operate effectively in response to signals received from occupants and to dynamic responses of building and its heating , ventilating and air conditioning system . the disclosed processes , apparatuses and system utilize thermostats equipped with a drift ramping and hold time to save energy ; the thermostats only need resetting to a neutral / comfort set point which is accomplished by means of a push button or touch plate . the disclosed systems are pre - programmed and set so that occupants will be confortable although the temperature within the building drifts because the rate of drift is controlled to a gradual and normally unnoticed change .