Pub. 2 2014 Directory

29 Due to the natural cross ventilation, no chillers were required for cooling, reducing the carbon foot print. An in-floor radiant heating system was utilized with 97% efficient gas fired boilers. Exposed natural concrete walls and floors in the lower level, and portions of the upper level, provide thermal mass to enhance the solar gain and radiant heating system. Only minimal forced air was required. The residence achieved a home energy rating score of 57 – well below the local requirement. This was achieved by utilizing several best practices including whole- envelope insulation, heat-recovery ventilation, radiant heat, and optimized solar gain. The home was impressively air-sealed and tested at 1.26 ARH50°. Maximizing the thermal envelope allowed for minimal mechanical equipment resulting in a quiet, efficient, healthy and comfortable home.