Cooling Down in a Hot Tub
The hot weather doesn't mean you should stop using your spa. Turn the heat down to below body temperature, or if possible turn your tub to economy mode. In addition, taking off the cover and running the jets, the water temperature should drop. Water in the hot tub will heat more slowly than the outside air, therefore a well insulated spa with the heat turned back, will heat up only as high as the evening air temperature. Turning on your air jets, will also cool down the tub. An inuslated cover will help against absorbtion of the radiant heat due to direct summer sunlight.
Even turning your tub's temperature to 95 degrees F will cool you down. Unlike a pool, you are not as active in a hot tub, so you are not creating body heat. A 95 degree F tub on a warm evening may just be the answer to cooling off from a hot day's work.