Last month, our electricity bill was about $108. It was hot last month so I set our thermostat to 85° during the day and 76° at night. I thought, by doing so, I'd be saving us a TON of money because the a/c wouldn't be working as much during the day. I thought I was all that AND a bag of chips.
Until I opened our electric bill today. $214+!! I then had to sit down and put my head between my knees. That's not only double last month's bill, it far exceeds my budget for that utility. Thankfully, I have some wiggle room because our gas bill is so low but dangit!
I talked with a friend of mine whose father is a mechanical engineer with some 40 years of heating/cooling experience and she pointed out that having such a discrepancy between the daytime and nighttime thermostat settings might be making the a/c work harder to cool the house down as opposed to setting the temp to either one constant setting or keeping the day/night settings closer in range. So it's possible that, by trying to SAVE us money, I've costed us money. Poo. Absolutely not what I had in mind.
However, there might be a bit of an upside. I reset the thermostat to 80° during the day and 78° at night (and before you all get worked up over how hot that is, keep in mind the fact that I lived in Hawaii for 6.5 years and 85° during the day was JUST. FINE.) and we'll see how the next bill shakes out. July has been wicked hot (and dry) and it looks like August is going to be the same, if not worse. Fun times in the heartland, I tell you!
At least it will cooler here during the day!