The heating and electricity demand of the complete complex were reduced by integrated planning decisions to an extremely low energy level, so that the demand could be met completely and economically by regenerative sources of energy. Two-thirds of the heating energy is covered with free environmental energy by passive use of solar energy, facade — integrated collectors, ventilation with heat recovery, and an earth-to-air heat exchanger, which can also cool the inlet air in summer. The remaining third of the heating energy is supplied by a boiler fuelled with wood pellets. A photovoltaic array on the church roof provides the electricity needed.

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exhaust

Cross-section indicating energy systems