I had similar issues, also in Texas. Though, at this point I think the primary culprit is actually the air conditioning unit.
Well, first off, are you using an at wall wattage monitor to verify how much your rigs are actually using? You should be able to calculate their electric cost with your rate and see how much it should cost on a per month basis (there’s a bunch of online calculators you find to plug in the numbers). The electric listing in most mining apps is usually less than the entire rigs is actually using, since it tends to just account for the GPUS.
Next off, since it’s Summer in Texas, how are you cooling the rig? Is it just inside the house with the regular AC in charge of cooling it? Your electric company may have a breakdown of your usage. On mine, the AC went waaay up (and, it has stayed high with the rig off, so some of that may be seasonal increase of heat).
I was also debating a free nights and weekends plan, and just running the rigs then, but they do tend to be more expensive per watt during the rest of the time. If you figure out your total energy usage, and it’s free half the time, you can try just plugging in 50% of that value at the higher rate and see how the numbers look. That is a bit rough, since people do tend to use more electricity outisde of rigs during the day, when they’re awake. The same is also true with AC - it’s hotter during the day, so it runs more then. The rigs are the only thing likely to be running 24/7, so you may want to only count them 50%, and the rest of your electric usage still count at a higher value, like 75%.