So, we had the first of our 2 parties this weekend. I started heating the pool this morning at 6:30 am. It was a brisk 62 degrees due all the rain we have had and the cool nights (low 50's). So, the pool water is now 78. We have another party tomorrow. The temp is supposed to go down to about 51 tonight. We do not have a solar cover or solar heat (solar heat may happen next year). So, I've burned through quite a bit of natural gas today. Would I be better off (as far as gas usage goes) keeping the pump and heater running 24/7 until our party is over tomorrow night or just letting it shut off tonight and start heating up again tomorrow morning?