My first apartment was surrounded on four of six sides like that and I never used heat in winter. It never got cold enough to need more than a light jumper. I'

My first apartment was surrounded on four of six sides like that and I never used heat in winter. It never got cold enough to need more than a light jumper. I'd be curious to know what difference it made to your power bills turning your heating off, since if it's sitting above 19° then it was probably just running the fan anyway. Thinking about it, you probably get all sorts of interesting feedback loops going on between the thermostats of neighbouring apartments.