We don't have any electricity, so we're thinking of purchasing this Koolatron cooler.

Most of the drinks I put in it (refreshment cans, water bottles, etc) will be warm/room-temperature.

Will it make these things cold?

What else do you suggest?

  • More info on this cooler is available here: sustainability.stackexchange.com/questions/6214/… Commented Oct 14, 2017 at 21:11
  • According to the FAQ, the manufacturer recommends pre-cooling anything you put in the cooler. This implies that it will cool them, but it may take a while.
    – LShaver
    Commented Oct 16, 2017 at 21:30
  • 3
    We don't have electricity?? That thing uses electricity.
    – user2451
    Commented Oct 18, 2017 at 7:38
  • How are you going to charge batteries? Do you have solar?
    – paparazzo
    Commented Oct 31, 2017 at 15:58
  • It is essential that anything going in is cold; It does not cool, it keeps cool things cool. Commented Jul 12, 2018 at 1:05

2 Answers 2


The answer is clearly no due to the Second Law of Thermodynamics. One consequence of this law is that heat always transfers spontaneously from a hot body to a cold one and never the other way round. If you want to reverse the flow, you have to apply work to the system.

Given that you have no electricity you are not applying work to the system. As that box is insulated, the drinks inside will be a bit warmer or a bit cooler that the surrounding environment for a while(time lag for heat to trasfer). As soon as you open the box inside and outside temperatures will reach equilibrium.

  • 1
    You are right if the OP doesn't use a battery, but whether he does or not is unclear from the question unfortunately. There is an earlier question from the same OP where he mentions he's thinking about buying the cooler and battery: sustainability.stackexchange.com/questions/6214/…
    – THelper
    Commented Dec 13, 2017 at 15:52

They cool slow. So overnight yes they will be cool. Do you have water & a down hill slope? If so a drop cooler. Run water slow let it drop pool drop pool drop. 3 foot at a time. The more drops it makes the colder it gets. At 3 drops in 10 foot water will be 50f if shaded. In the tropics. Colder water will be colder. This is a very primitive way of cooling used only in a few locations in mountains.


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