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Berlin – A few years ago, no penthouse planner could have guessed how warm summers in Berlin would one day be. That’s why air conditioning is a rarity here, even in newer luxury apartments. Owners often shy away from retrofitting, because it can take several years to have the facade installation approved at the owners’ meeting. Then there are the high costs. Apart from the offers for the interior, but they often leave a lot to be desired optically. So if you live at the top and want to be admired from the lower floors in summer too, use the following tricks that make life in the living space close to the sky cool again.