The airconditioner can be used in the room, if the room temperature is high. The ideal room temperature for newborn babies who are well covered is 28-30 degree Celsius. While covering a baby make sure that baby's head, hands and feet are well covered. During first 4-6 weeks of age newborn babies are vulnerable to get cold. Easy way to check if the baby is adequately warm is to check the soles and abdomen of the baby with back of your hand. Both should be equally warm, the hands and feet should not be cold to touch.