Our First Energy Bill

Our first energy bill was 25% lower than the bill we received the previous month in our old apartment and also 25% lower compared to what we paid last year at this time. Unfortunately, I could not compare the kilowatt hour usage, because I did not save the old bill, but I am fairly happy. I was hoping for more of a savings, because our new place is half the size of our old place, but I think there is a point of diminishing returns when it comes to saving energy; house size is not directly proportional to energy use. Also, our ceilings here are vaulted, whereas our old ceilings were not, leading to a vertical square footage that also needs to be taken into account (for cooling costs).