Mine also went up, and so did the bill, by a lot. They estimated the previous month so I got stuck with a much larger bill this month.
Same here. Last months bill was lower than I expected. The current bill was measured and made up for the last bill. Thankfully my well insulated and small house costs me very little to heat and cool.
Because 900sqft....
As well as being insulated by other apartments above, below, behind and next to it. My g/f's condo hardly uses anything for heat as she keeps it at a cooler temp. The neighbors probably have their heat cranked and she benefits from it.