newby, water is freezing

I don't know your location, but if your pool is in a sunny place and the night time temps heat up, you will see the water temps come up too.

You might invest in a solar cover to put on the pool. It helps during the day to keep the sun's uv rays from consuming your FC, and insulates the pool at night from the cooler temps.
 
I concur on the pool cover. My water was a balmy 84 when I got back from my vacation and pulled the cover. Then we had some cooler weather and the cover was off, dropped waaaaay down. I find the wind is the biggest culprit. It makes the water evaporate faster. And evaporation cools the water.
 
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