'Considerably more effcient' you say. Please don't let the new lagging mean that the temperature will be even more stifling. The pool doesn't need to be so warm, and neither does the ambient temperature. Could you find out whether there is a legal minimum, and if so, make sure they keep it to that temp, or if not, persuade them to keep it a degree on the cooler side. Sweating while in water is interesting, but ultimately uncomfortable!