I haven’t used my pool as much as I thought because the water always felt so cold. The weather is warm here during the day, but at night it cools down. I think that was making my pool water cool as well.
I have a cover now. I tried it out this week. The pool was covered for almost three days, and then I unrolled it for a swim. The water was warmer than usual! Nice!

It rolls up on a thing that the former owner left behind. I think it’s a little unsightly, but if it makes the pool water warm, I don’t mind at all!
The cover material looks like glue bubble wrap to me – gee, another use for that besides stress relief popping bubbles. Who knew?
I meant “blue”, not “glue”…duh, Carol.
Yay! I am so glad you are using it – a spa experience right in your own backyard!