In winter, the heat recovery system is almost required for passive houses since up to 30% of the heat escape through ventilation. However, this is the case of ordinary houses. Molehouse is different. Even if cold air enters the house, it immediately heats up to the indoor temperature thanks to the massive accumulation
. As a consequence, Molehouse benefits from a stable indoor temperature
. The energetic balance is almost zero because the energy is constantly supplied.
The heat recovery system is installed in Molehouses only because of greater comfort during ventilation. In this way, residents of the house do not ever have to worry about the supply of fresh air.