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- Philips Experimental House Research 1974ff: Passive versus Active Measures in Europe & America
- day. In fact - apart from the windows, which were not available, but under research and beginning devel... ppeared economically feasible. Basically that has not changed until today (2012) – but, the energy pric... ndow areas beyond 30 – 50% of the South façade do not lead to additional gains in well-insulated houses