What strain of yeast was it? Arguably, temps over 78 could be detrimental to the yeast. Perhaps it could be that some people may have difficulty quickly chilling their wort much below 78, especially in the summer.
Frankly, it is better to get your pitch temp closer to your fermentation temp.
Brody's Brew House
Primary: Spiced ale
Planned: Butternut squash & gala apple harvest ale; brown ale or porter; barley wine
In the fridge: Dogfish 60 minute; Imperial Stout