Energy saving using ventilation systems
Something already built-into a passive house can also efficiently lower energy in a low-energy house - a ventilation system. It guides the used air via a heat exchanger that transfers the heat from the exhaust air to the inlet air. The fresh air therefore needs less energy to heat up. In addition to this, even more energy dan be saved by correct ventilation: Outside of the heating persiod, good-old "manual ventilation" is recommended, because this saves electricity for operation of the ventilation system.