We live in an old building with steam radiators (no individual thermostats). The building is mostly inhabited by elderly women who apparently complain A LOT when their apartments are below 75 (80?) or so. Thus, we leave a couple windows open year round....

I do love that the radiator pipes act like radiant heating in the tiled bathroom...nothing like warm floor when you first get up. I don't miss my grad school apartment...5 winters with virtually no insulation in a cinder-block box with a little tiny furnace. Good times.