Optimum atmospheric humidity of 50 per cent
Precise regulation of the air-conditioning system ensures that the temperature cannot deviate from the recommended guide values by more than one degree centigrade either way. The recommended guide values in summer and winter are 23 and 21 degrees respectively. The maximum permissible deviation from the optimum atmospheric humidity of 50 per cent is 5 per cent, and carbon filters are also used to keep the air clean.

In all the areas open to the public the Zentrum Paul Klee will be fully air conditioned using a whisper-quiet installation.

Energy consumption as low as possible
A whole range of measures have been taken to keep energy consumption as low as possible. Excellent insulation of the roof, ceilings and floors reduces to a minimum any heat loss in winter and any warming in summer. As waste heat is recycled to heat the supply air, there is hardly any loss of thermal energy.

Large shading elements along the main glass façade avert any unwanted direct sunlight. Efficient double-glazing and high-efficiency systems for electric lighting, heating and ventilation also contribute towards moderate energy consumption.

Solar collectors, wind-driven generators and photovoltaic systems were all examined among others as potential suppliers of energy in the search for the most economical and ecological source of energy. As it was impossible to find any indicative reference projects for the Zentrum Paul Klee using these rather unusual solutions, the decision made on the basis of the cantonal regulations was for natural gas.

According to present estimates it can be assumed that the outcome of the assessment of the annual energy consumption, measured against the stringent Swiss norms for building construction, will be very good.