I don't know what Country your in so what I say may mean something else.
Fans, bigger the better pointed at the tank.
Swamp coolers, big fans with cloth that is wetted to cool the air. Ice cooler is a fan blown over 20# + of ice. It will cool the air for a few feet or small room.
AC, portable or window shaker in the room with the tank.
Pull the blinds so the house is dark. Keep the heat out.
If you have old school windows open the top window.
Do not unplug your thermostat, your heat won't come on till needed.
I have window shakers in the snake an dog rooms. For the snakes the AC is set at 85F. My old farm house still doesn't have AC. One for these days I'll by the split units for it.
Good luck!