Hi fellow Houstonian. Everything stated by
@Texas Splash is exactly as I do. Definitely if a hard freeze (below 30 deg) is predicted, I lay a tarp over the equipment. The heat of the pump keeps everything nice and warm. I have freeze protection setting on my Jandy automation. I keep that a little high (upper 30's deg) to ensure the pump does turn on before any drop to below freezing.
If you have any water features you may want to consider those as well. Best not to turn them on in a hard freeze assuming majority of the pipe is underground and protected. If not, then wrap any exposed pipe as you would your external faucet.
In recent TS Beta, I drained about 6 inches of pool before the storm came and it filled up close to 8 inches over the 2 day period and I had a drop of at of 10 in CYA as well.