You definitely have to read the fine details on the "free at night" plans. The price they list is based on an assumed percentage in the "free" time period mixed with a very high not-at-night rate. So the not-at-night rate is NOT the rate you see advertised. IIRC the advertised top-line rate was 10 cents while the actual rate for not-at-night was something like 13-14 cents/kWh. That can still work for you if you can move almost all your usage into the "free" zone but given that Houston is a high A/C usage town, you'll need to be rather aggressive in your temp control and even then you're likely to end up with a good amount in the paid zone. I definitely wouldn't do it without an EV that I expected to put a lot of daily miles on, and even with an EV you'll need to consider a "lifestyle" accommodation.
For me in the end it became moot because I went with my own panels, and there's no plan combining "free/cheap night time" with buy back for my excess power. The good news for you is I can share some data to give you an idea of what you'd be facing because I've been messing around with trying stuff out anyway, and the panel equipment tracks usage around with production.
YMMV of course but here's a 15 minute interval of my power usage from earlier this month (I'm North of Houston). The blue is solar production, the orange is usage. Where they are lighter shade is where one is offsetting the other. I marked the 8pm point for easier reference. I have the thermostat set to 74F overnight, then raise the set point to 78F at 7AM, lower it to 75F at 5PM and then to 74F at 6:15PM. This is around my wife's typical work day, as 74F is the limit that she'll bear.
The baseline of about 2kW from midnight to 6AM is my pool circulating pump, the big hump starting just after midnight is the EV's daily (it was about 80-90 mile worth IIRC, which is typical for us). The spikes at about 2:30am and 5am are the A/C. Even with the raised daytime set point you can see by about 4pm the AC kicks in anyway, then it's catching up from the day. There might be a load of laundry late evening, too. Not sure, never tracked that.
If you aren't ok with letting the temp rise like that during the day (which happens for us on the weekends, because "happy wife, happy life"
) it gets pretty ugly.