last august AEP was working down the street, when one of the dump truck drivers drove away with his bed up. the shmuck took out about 8 blocks of the grid from one overhead line
about 92 deg out, 2nd day without elc, 75g creeping up to 84deg
got the bright idea the make a "cool can" (a old raceing term).
got a glad lawn&leaf garbage bag, tossed in the magnum 350 external.
droped that into a cooler, filled the cooler with two bags of ice.
and had the tank temp down to 75deg in 90mins.
(good in a pinch)
long term? fans across the top, for a water evaporation type cooling is best
(i own 2 7500 watt generators, before you ask)