I live in HOT Austin Texas - 100 right now at 5:45PM. Last month I used 2196 KWH for $230.60 (.1051 per KWH) Our home is about 27 years old, 2000 sf. total. 1200 sf is 27 years old and not well insulated; 800 sf we built on 6 years ago and it is very well insulated. We have two AC units - we put a separate one in the new addition. We have a den and my office in the new part and we stay out there almost exclusively except to sleep, of course. We keep the thermostat on 78 out there with two ceiling fans in the den and one in my office.
We keep the "main" part of the house at 80, unless I cook and then I turn it down a little. I don't cook much in the summer - we eat lots of sandwiches, fruit salads, etc. or cook out on the grill.
At night we turn the air down to 74 to sleep. My hubby has a heart condition and has to use oxygen at night. The oxygen concentrator (separates the oxygen from nitrogen in the room air) creates lots of heat, so our bedroom usually stays about 76-77. We use a ceiling fan and a floor fan blowing directly on us. We have two yorkies and they sleep under the covers!
My water bill was $50 because I have to water some trees every week. I planted trees a few years ago in front, side and back and they are getting big enough to provide some shade and help keep the house cool - but they do require some water right now. They are very drought tolerant, after they get a good start I won't have to water them so much.