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That's naive. Modern building code in the US is pretty/very heavy on energy efficiency. And of course European buildings heat up.

• dzhiurgis 8y ago
  All new buildings in EU now have to be A+ energy efficient meaning it’s nearly self sufficient - heats up from human heat and air-to-air heat pump.
  • sgc 8y ago
    So, basically the same legislation as what California had implemented a few years before the EU.