Also new is that when employees are out instead, they lower the curtains down to reduce the heat from the Sun will come in and it will make the work less air conditioning.
From spatially expect to hear that when employees leave the room and let them lower the blinds to reduce heat from sunlight to enter the building will cause the air conditioner to run less.
From speculation to you that when employees leave the room, they reduce the curtain down to reduce the heat from the sun to come into the building and makes the air conditioning let down.