Heating systems in skyscrapers have much more powerful fans than in homes, because they have to push the air a lot further and often high into the sky. Also, they usually have stronger filtration systems because in skyscrapers you cannot open the windows to let fresh air in. There are often very large air conditioning units on the roof or sides of buildings, as they need to keep cool in the summer because they are not shaded by any trees and their windows, again, do not open. They use a lot more energy than home systems and can really benefit from retrofit into energy efficient systems.
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