True. I still have a lot banked because I didn't use the heater this year except in late May. Usually in Sept I run through most of the banked energy, but this year the weather wasn't the best to swim late in the season. I bank a ton from Oct-May.
Mine is 72. Totally not worth it, but figured two days with the heat on and hopefully sun tomorrow might get it warm enough. I haven't used it in a few weeks.