After buying a roomy, character-filled duplex four years ago, Jessica Jensen, 36, and her husband, Jason Pelletier, 37, set about making several eco-sensitive improvements and were stunned by the lack of information on sustainable products and strategies for conserving energy and water. Their curiosity soon grew into a calling, and by 2006 they had quit their marketing and consulting jobs and launched Lowimpactliving.com, a site that helps consumers make greener choices.

One might assume that Pelletier and Jensen lead a granola-and-Birkenstocks life, but their home proves that livability and sophistication needn’t be compromised in the name of an eco-conscious abode. Read on for a room-by-room look at the changes they’ve made thus far.