Energy saving apparatus and method

An apparatus for saving energy in climate controlled space infrequently occupied, the apparatus comprising:

• a switch operable by a specially adapted object in the possession of an occupant;
• the switch assuming a first state when the object is received and assuming a second state when the object is removed;
• the switch being adapted for mounting near an entrance to a room;
• and
• a housing including:
• first means for disconnecting power from light circuits in the room in response to the switch assuming the second state and connecting power to the light circuits in response to the switch assuming the first state;
• a first thermostat having a set temperature not controllable by a room occupant, the set temperature reducing energy consumption;
• second means placed in series with an air conditioning unit and a second occupant-controllable thermostat, said second means for switching the first thermostat into series with the air conditioning unit and for disconnecting the second thermostat from the air conditioning unit in response to the switch assuming the second state;
• and
• delay means for generating a delay signal for a predetermined period following receipt of a signal from the switch indicating assumption of the second state upon removal of the object;
• the delay signal being provided to the first means for disconnecting power and to the second means for switching the second thermostat in series with the air conditioner after the predetermined period;
• wherein the apparatus is adaptable to be retrofit to a room having previously installed occupant-controllable thermostat and air conditioning unit or to be used with separate thermostat and air conditioning units;
• the housing having a plurality of terminals thereon for attaching wires from the previously installed second thermostat and to the previously installed air conditioning unit, for attaching control wires between the housing and the air conditioning unit, and for attaching a power line to supply power to lights.