New types of washing machines designed to consume less energy also extract less water from laundry during their final spin cycles than do washing machines that consume somewhat more energy  The wetter the laundry, the more energy required to dry it in an automatic dryer
Thus using these new types of washing machines could result in an overall increase in the energy needed to wash and dry a load of laundry
The more people who work in the library's reading room, the noisier the room becomes; and the noisier the working environment, the less efficiently people work. Ttherefore, when many people are working in the reading room, those people are working less efficiently.