It's interesting, but not really practical except in specific conditions. When they talk about getting the food temp down to 43F, it can't be done unless the temp outside is 65F or below and very dry. There is a chart of temperatures and the humidity needed to get these temps on the
Rebuilding Civilization website. It's an interesting idea, and works well in evaporative (swamp) coolers in dry climates, but you probably won't want to throw your refrigerator away just yet.