I am using a solar cover as well this time of year. During December and early January, when I heated to 88 and didn't have a solar cover, the temp dropped to 77-78 overnight and it takes the heater a good 3-4 hours to bring it back up.
With a solar cover, it only dropped to 83-84 overnight and took the heater 1-2 hours to bring it back up.
You don't need a high end cover - they list them as 2 year, 5 year, 7 year... none of them will last more than 2 years in the Florida sun. I got mine for $37 at Home Depot. Get the cheapest one you can get.
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