I think that this type of idea is your best bet. It appears that sun's problem was that her fridge was set too cool. I personally keep my juice in the bottom drawer of my sewing cabinet which sits right near my AC vent.I had a bit of an idea... if you had a mini-fridge and set the thermostat in it as high as it would go (making it a warmer temp not cooler) would it be at an acceptable temp for the PG? Does anyone have a mini-fridge that they are not using or could keep empty for a few days? If so set it as high as it will go, put in a thermometer and check in after a couple days to see what the temp is. If its around say 65 degrees than we may be on to something. Anyone out there who can test?
For those of you that might keep large stock of juice - I found an article on how to turn a mini fridge into a wine fridge to help keep the temp stable How to Turn Your Mini Fridge Into a Wine Refrigerator: 7 steps (with pictures) - wikiHow
You would just need to set the temp for optimum juice storage Store in a dry ventilated area at a temperature of 15°C to 30°C (59°F to 86°F). Protect from light.