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Keep the cover on.Don't expose an empty hot tub to a hot sun if at all possible.
In the last 3 hours, with the lid closed the tub has gone up 3 degrees. Â I'm guessing I should have just left the lid closed all day. Â Its down to 92 outside now and 90 in the tub. Â Not to bad...Oh, and we didn't have power from about 12-4 today so there was no heat from running the circ pump or anything.
I cleaned the cover for the first time. Note to others: Clean off bird poop immediately. It takes the color right off the cover.