My bill isn’t that high – runs around $100 or less. Mind you, this summer was cooler than previous years. But still, there was a big difference in the cost.
I have the widows covered up with insulated foam panels for the winter. Still not making a dent in the dust which is really aggravating. I have those old timey composite ceiling tiles and a construction friend thinks that may be the issue. The original ceilings are plaster.