We have a solar system with a gas heater back up.
The settings on both are at 84 degrees. This time of year the gas heater gets the job done in a couple of hours.
As the evening temperatures start to slide into the 60's and below the gas runs more the next day.
We usually shut the heat system down mid December to first week in February.....just too cold to get in and out of the water. Heaters will still do the job but run almost all day long....$$$$$!
The first couple of years we used a pool cover. Gave that up. Our pool is very irregular and is a mini task to cover and uncover. We found it did help but the sight was not worth it. We would much rather have the better views all winter long.
Going with just solar will not keep the temp where it is comfortable this time of year.
All the above is based on our experience only.
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