Centralized heating - oh yeah! My big U alma mater had a central heating plant. Was coal-fired for years, eventually had signs up for blocks around it, mentioning the fall out. Ate up car paint.
All over the large extended campus, miles and miles of steam tunnels ran underground (the winters were cold, but no permafrost
). Every block or so, there were tunnel vents. These looked like a rectangular kitchen-sized table, made of concrete, lower than table height. On all four sides, set in, were metal grills to allow venting of the heat given off by the insulated pipes. They looked like nice places to sit, but were not! Could hear a hissing sound from them of steam flow.
On the coldest night(s) of the year, if below zero enough, they would have rotating "steam outs". The pipes all through the building, that had been pressurized since fall, went cold. Living in a dorm, about 2 - 5 AM or so, the contraction of the long steel pipes throughout the building, with elbows every so often to take up
some movement, was quite an event!
Pent-up stress due to contraction would suddenly let go with a bang, which echoed along the pipes. Like a loud building-wide chime. Every few minutes, till they settled down. Then, after falling asleep finally, re-heat would start, waking us up again with another concert of expansion. The bangs would get less frequent, but there always was a nasty big one for a finale, well-spaced later in time to get us.