I've found a lot of bills are driven by how well insulated apartments are. Some leak heat left and right. Another factor is how many open surface areas they ha

I've found a lot of bills are driven by how well insulated apartments are. Some leak heat left and right. Another factor is how many open surface areas they have and the size of windows. I had an apartment that I rarely heated in the winter because it was wrapped on 5 of 6 sides by other apartments and the only exposed surface was a wall. Other apartments had multiple outside-facing walls/roofs.