What Comes After the Low-Hanging Fruit?

This chapter considers the next generation of energy efficiency approaches, designed to realize significant energy reductions in already-efficient buildings. Three quite different approaches are discussed, that represent the breadth of new energy efficiency technology- solar cooling systems, comfort based HVAC control, and energy behavior intervention, that each shows great promise. Ultimately, realizing energy savings is a continual process, with no end in sight – no matter how efficient a building is, with these technologies, further savings can be made.