A Passive House certification is one of the highest available for energy-efficient homes. And this residence hall in Belfast, Maine demonstrates that, “space heating costs for TerraHaus are less than $300 per year ($30 per student), a big improvement from the two poorly insulated housing units it replaced, each with an annual space heating cost of about $500 per student.”
That is a 94% reduction in energy bills – helped out by the rooftop solar panels. The dorm sleeps 10 students and features chemical free building materials and durable fixtures to survive many school years. There is a solar water heater, an ultra-efficient (88%) HRV system that circulates in fresh outdoor air, and windows that absorb and keep in sunshine during the winter (50% solar heat gain).
The walls and roof were constructed to minimize any heat loss during the winter. They were measured for thermal efficiency using R-values and the walls achieved a value of 50 and the roof 80-100. The typical home has R-values ranging from 18-25 for walls and 50-60 for ceilings.
It’s an impressive home and worthy of the Design Award it received.