Yes, typically large buildings are cooled year round, especially when they are cubic (not sure how this effects tall, skinny skyscrapers). Usually when you see

Yes, typically large buildings are cooled year round, especially when they are cubic (not sure how this effects tall, skinny skyscrapers). Usually when you see "smoke" coming from the top of a building in the dead of winter, that's from the cooling units. Much heat does come electronics, lighting, humans, but there are still heating units to have precision control as temperature will not necessarily distribute evenly. There are, as one might guess, a lot of factors at play and no universal solutions. Certainly the pure form office buildings of the International Style are almost completely naïve to these considerations. The biggest tragedy is the air controlled paradigm of hvac. Air is so not dense relative to water! Doesn't hold energy and very hard to push around (push a column of air up 20, 50, 100 stories? Not happening). This is directly related to the early success of the Carrier ac company.