Keeping tank cool while windows are replaced

I have a 55 gallon reef tank mix of SPS and LPS and we are having our windows replaced in a few weeks. The work is supposed to take a day but temperatures in my area have been hitting low to mid 90s off and on. Unfortunately, the scheduling of work is out of my control. Everything I've heard says tank temps above 84F are bad. Does anybody have any experience with a tank at above 84F? What preparations should I make? Or will my tank be able to last a day? Thanks!