For those who live in Florida, Southern Texas, anywhere around the Gulf of Mexico, it's the humidity much of the time that drives the feeling of it being hot inside the house.
We own 2 dehumidifiers and I run them a lot during the warmer months to take some of the humidity our of the air in here. It doesn't take very long for them to fill up with water
I like it around 75, and I have to be honest, after the weight loss I tend to get a little colder more easily, with the dehumidifiers running, 75 is pretty cool vs 92 outside
Mrs likes it more 72, I like it a little cooler at night to fall asleep.
If you have a 2.500-3,000+ sq ft home in Florida and run your AC at 70...yeah you're gonna run a $500 AC bill
Also because we now work in the house most of the time, you're going to run the AC more when you are home.
I could see solar panels being part of the overhead or tax write offs for work/business, that's gotta be on the table when you think about implementing these on to your property.
I know whenever we decide to buy a SFR in the "Sinkhole Alley" section of Florida

definitely going to have a couple acres and a specific section of the property to put these in.
Do you save money doing it? Maybe, maybe not but I respect and understand why folks try and do this. Sounds like it is working well for some of you.