We are always excited by the opportunity to put our knowledge of energy efficient technology and building strategies to work. Currently, The Friends School of Portland is our greenest building project to date and one of the most energy efficient buildings in Maine. The Passive House net-zero school runs on a combination of solar power and minimal heating and cooling systems that go so far as to include students' body heat in the design. Warren Construction Group's air sealing techniques resulted in extremely low blower door tests (.34ACH @ 50p), enabling this minimal HVAC system to provide high-efficiency year-round comfort. In keeping with Kaplan Thompson Architect's contemporary design, we salvaged and milled the logs from trees cut down on the property and incorporated the 24-foot-long boards in the school's Meeting Room. While we enjoyed the building process, our greatest satisfaction comes from watching the students engage with what we've built—including the numerous play structures in the school's back yard.