I have a few of those plastic ice block things that you use in coolers. If i see the temperature getting too high on a hot day (like today haha). I drop one in the sump. Will usually bring the temperature down gradually about 3-4oC. If its really hot I can throw in two. Freeze them again over night.
Not great when its hot everyday but I find I only have to do that maybe 5 days or so during the summer.
Martin
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