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Performance based indoor climate and ventilation regulations, having mainly been based on the requirements for the end result with fewer requirements for the system description, supported by a voluntary advanced indoor climate classification and labelling system, have arguably led to the best indoor climate standard in the world in both residential and commercial buildings.
In this respect, the Finnish story is ultimately a success story.
On the energy performance side, the primitive regulation based only on the requirements of U-values has caused some drawbacks.