"The Roth family house was to be made completely environmentally friendly. This starts with the untreated larch wood facade, which naturally greys, and is maintenance free. As a KfW energy-efficient house design 40 and with an annual primary energy consumption of 27.0 kWh / m² this house is a true energy saving miracle. It is equipped with an intelligent decentralized ventilation system and a heat pump. As a climate-friendly house, it also actively contributes to the reduction of CO2 emissions and thus to improving our global climate. In the long term, this wooden house will save more than 40 tonnes of CO2."