The apartment I was referring to used boiler heat, not furnace heat. It all came from one place and we couldn’t adjust it ourselves. Not shut-off valve for our unit, not even a water control valve to slow the flow rate of water for our unit. The superintendent was the only one who could control it. We were up on the top floor too so it was hotter up there. I did complain about the heat several times, but while we were hot, the lower floors would be comfortable or even cold (heat rises and all that), so usually she wouldn’t do anything about it. Any time someone would complain about the temp (either too hot or too cold) she’d do a building survey. If most people would agree then she’d change it, but usually the top floor was always too hot and the bottom floor was always too cold. We only lived there for a year before moving out.