<prompt> Human: Hi, Ive been tangled up with Duke Energy trying to understand why my power bills skyrocketed. I dont make much 28K before taxes so a big jump in my power bills hurts a lot.Ive got a guy coming to check the meter in a few days. My bills show me using 3-4 times as much power as I was using in previous months, but my habits havent changed at all. Heres what Ive done so far:-I changed my AC filters and set it to 75 degrees rather than 70. The weather is cooling down now, so I dont have my AC on at all. I just crack open a window, and its pleasant enough.-I had the apartment check my AC unit, they didnt find anything wrong.-Im going to the apartment office today to schedule a maintenance on my water heater.However I strongly suspect this is an issue on their end, as again my habits havent changed.Any idea what else I can do?  <response>: I changed my AC filters and set it to 75 degrees rather than 70. The weather is cooling down now, so I dont have my AC on at all. I just crack open a window, and its pleasant enough.How long ago did these changes happen? Long enough to be reflected in your bill or at least observed usage? Because while 250 is high I can also completely believe it could be caused by AC. Especially set to 70. 