I don't think I have ever pitched at 90 or above. I find for myself and my 5 gallon, on the stove, extract brewing, that even though the wort chiller is good I still can't get it down below 85 or so in the summer (live in GA). I have found that adding that last 3 gallons of spring/drinking water that I bought at the store and left in the freezer for a couple of hours really is my saving grace for good fermentation. After adding that to the wort in the fermenter, I will be able to get it down to a 66-68 before pitching. Then I have a closet that luckily has an A/C vent in the ceiling and during the night it keeps it relatively in the 70's until main fermentation is done. I also cheat and add a bit of yeast nutrient to make sure it doesn't get stuck.