Exterior, Wood Siding Material, Metal Roof Material, Gable RoofLine, House Building Type, Farmhouse Building Type, Green Roof Material, and Shed RoofLine “Often when we talk about sustainability we focus on the gadgetry, what makes things feasible off grid,” Moffitt says. “But to me there are more interesting things in passive design that rely on the available sun and wind.” An eight-panel solar array does chip in significantly, generating all the electricity the house needs.  Photo 15 of 16 in A Sustainably Built Home in Rural Ontario