Anyone with a coolerdor and a refrigerator can bring down the coolerdor's temperature easily. Wrap a cold can or two of whatever beverage you have handy in a dish towel or hand towel, put that into a ziplock bag, and place in cooler until the interior temperature is more to your liking (or the cans have warmed up to the same temp as the cooler). The towels will provide insulation keep the temperature from dropping too quickly, while the plastic bag keeps moisture from the air inside the cooler from condensing and lowering the RH. You can also use a refreezable "blue ice" pack; just wrap it a little more and it will probably stay cold for several hours.