I live in a vintage condo unit in Chicago which has radiator heat. The radiators are set and I've been told to never tamper with the knobs. The boiler systems turns on and off when the temperture reaches a certain level. There are monitors in a couple of the units to determine the ideal heat assuming everyone else has not tampered with their radiators.
Although the windows are new and doors are sturdy, heavy and thick it's gets drafty in the winter and cold when the radiators turn down and the temperature stops to drop, although when the radiators are on it's gets extremely hot.
What can I do to insulate the windows but not sealed them until Spring, if I want to let in some air to cool down the place? All of the radiators have these metal covers, but one of my radiators has a tin tray on top it, underneath the cover. I was told this is used to create moister and keep the place from getting to dry, which is also an issue.