Around a decade ago, New Zealand–based architect Rafe Maclean designed a house. "We thought it was going to be thermally quite good and efficient. Then it was built and the clients moved in, and they gave me some very direct feedback: It was such an energy-hungry house to keep warm," recalls Rafe. "It hit a nerve, and it got me thinking, ‘How can I school myself here? I need to do better.’"