Below is a translated bit from Die Welt. I will put up a link to the original if anyone wants to read the whole article in German. I'm interested in this and don't read German so I'd really appreciate if someone could tell me more.
"Insulation does not always reduce heating energy demand in residential buildings. Its application can in fact increase the consumption of oil and gas. This is the result of a number of studies. The results raise the question whether the Federal Government’s green energy transition may fail in its objectives. Particularly explosive is a recently rediscovered study by the IBP Institute for Building Physics of the Fraunhofer Institute. Based on an detailed comparative analysis, scientists at the research institute in Stuttgart established in 1985 that, given average winter temperatures of minus four degrees Celsius, the use of insulating does not reduce heating energy consumption; compared to house with solid walls it rather pushes up energy consumption." --Die Welt, 8 October 2012
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