The newly published fourth edition of the “ASHRAE GreenGuide” contains updated guidance that reflects how green building practices as well as the industry have changed. It uses an integrated, building systems perspective to provide need-to-know information on what to do, where to turn, what to suggest and how to interact with other members of the design team in a productive way. There are 44 GreenTips in this edition, including new ones on topics such as condensing boilers, rain gardens, green roofs and data centers.