I have my master spa 7.2 set at 97. my husband and I will go into it within an hour and half it will reach 100 or more. we have gone in it during the day and at night when it was 50-60 degrees out. we have had the hot tub two months. They have replaced both pumps and the mother board and it still does it. is the normal for hot tubs. I would like to stay in my hot tub longer. sometimes it hits 100 with in 45 mins. then I have to get out its just to hot for me. I paid 10.000.00 for it that I can't spend more than hour in it. Master spa says its normal for the temp to go up because its so well insulated. I feel not by that much .. I need help this is brand new. and I need know does other brands do this? or does other masters spas do this. there solution was to put it down to 94-95 so I can stay in it longer. I feel that is to cold for me. and its not solving the problem. am I getting the run around.