i have looked into zeer pots but they might not work so well here in fla. i am going to try again but this time i will put pots in shade and get them off the ground so the bottom can cool too.
I have wondered if you can put those double clay pot coolers into a hole in the ground? I have also read that they only cool to about 45 degrees. They will delay fresh produce deterioration, but are not cold enough for meat or dairy.
I have thought that they could be useful for cool cloths in case of injury, burns or illness.
I have also wondered if they could be combined with a 12v fan to increase evaporation and cooling.
Cooling would be a problem in FL or other hot, humid areas w/o electricity. I know when we lived there for 6 months, I noticed there were no basements. Up here, the cellar stays at about 57 degrees in the heat of summer and is still too warm for preservation.