pot-in-pot refrigerators (zeer pot coolers) will cool the air up to 40 degrees. no power needed. uses only 2 or 3 clay pots, sand, water and a towel. will cool the inner chamber up to 40 degrees (relative to the outside air). uses no electricity. will keep food fresh longer. note: i tested it when it was 120 degrees out. if you use it when the temperature is 80F-90F it will get down to 40F to 50F.

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32 thoughts on “Homemade Pot-in-Pot Refrigerator "Off Grid Fridge" cools air up to 40F (evaporative cooler/chiller)

  1. skinpro2000 says:

    You need to pour more water, one liter is not enough, it will also help if you use cold water, or let ice cubes melt in the sand, the inner pot will be significantly colder, you can actually feel the frigid air inside the inner pot., if you put the wet towel and cover it with one of those pot bases that look like a plate it will stay even colder, and even more if you wet the pot base before putting it on top, it will help keep everything cold inside, try it and make a video about it.

  2. MICRO POUSSE says:

    Hi again!
    another idea I saw it in other video, that we make a hole large in the soil and put inside in the hole a pot, without any pot inside !
    After put a little bit of water in the corner, Time to time ;)
    By by.

  3. Clueless in California says:

    It is most likely that what limits the cooling is the rate at which water can evaporate from the system. Addition additional insulation by additional pots or sand probably won't help much. If you could increase the surface area/volume ratio, you should get a greater cooling rate–so a smaller system might achieve a lower temperature. However you could fit less stuff in it (eg: your grapes example) and would need to re-wet it frequently as it can't hold as much water.

    The primary emergency use I can imagine for a zeer is to keep refrigerated medicines, especially insulin, cooled after a natural disaster until help arrives, or until evacuation becomes possible.

  4. Naleeni Das says:

    I need this sort of cooler to keep my Amaryllis bulbs dormant for a couple of months. Did you say 40 deg fahrenheit it cools down to? That is 4.4 deg celcius! Does it really get that cool inside?

  5. none of your business says:

    So, what would happen if you put one of these inside an even larger one? Would it cool the smaller one even more? I mean obviously there has to be a limit, but as long as its hot enough for evaporation to take place couldn't you theoretically just keep making larger and larger pots or sealed brick chambers with layers of wet sand between them in order to fit the smaller pots until evaporation is slowed to the point of not making a difference anymore?

    Am I over thinking this? Probably. I just find it interesting to think about.

  6. hi li says:

    You have to use a closed pot so the evaporating water cant get inside. Also, skip the sand. Water holds ALOT of thermal energy. The way you’re using the sand is basically the same as putting your pot in a bucket of water and setting it in the sun. It wont be hotter than the bucket of water, but the bucket of water is going to heat up because its going to absorb energy faster than it can evaporate. Ever hang out in a shallow pool in summer? Water gets pretty warm, but when you get out and there is a breeze you suddenly feel much cooler than when you were in all that water. Only water on the surface can evaporate and that’s where the cooling happens – all the water that’s in the sand cant evaporate till it gets to the surface; it’s like a pool of warn water. You want to keep the water on the surface.

    Take two pots of the same size; wax the inside surface. Turn one upside down like a lid to make a closed chamber with the two pots. Put the towel over closed pot and pour water over the towel, repeat a few times as the towel starts to dry out.

    I think you’ll have much better results with this method.

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