Using household parts and a reverse switching relay (from a heating a cooling supply store), you can build a walk in fridge without a Coolbot. Our fridge cools within a degrees or less and only has $30 of hardware; you could even use recycled parts. Let us know if you need more info and like us on

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22 thoughts on “Farm Walk In Fridge Built Without Coolbot!


    I have not been able to find a reversing switch and I have checked with every electrical component  supplier
    in our area!  Could you please post who the manufacturer is and the part number?  Thank you.

  2. Juan Suarez says:

    You basically engineered an alternative to cool bot. I could be wrong but if this is something you can build and resale I think people would buy it from you. Maybe build one and sell it and eventually sell more at a time. Thanks for info I would buy this thing from you if you sold it gonna buy cool bot since it's plug and play lol. Most people aren't as smart as you I don't know what you do and the time too. Might take too much time for me to figure it out might end up failing buying cool bot at end. Peace G-d bless

  3. Gary Ponder says:

    Way too much stuff. Put a freezer thermostat on the a.c. and let er RIP. If it gets too cold move it closer to the coils. Its not that complicated. I once turned an ice keeper box into a 12×12 walk in beer cooler that I later had to put a thermostat on to keep it from freezing.

  4. nmlittlebigman says:

    You could use a Ranco ETC 111000 controller to turn your bulb (heat source) on and off. They cost about $50. They are simple to use and you can program the temp and differential in it.

  5. mitchell rose says:

    Folks, just head to the scrap yard and salvage a thermostat form a domestic fridge for free, then wire it into your window a/c unit, eliminating the a/c units temp control system and thermo couple altogether.

  6. Jim Ruff says:

    You can do this without the lightbulb. The temperature probe is a thermistor (verify that by checking the parts list!) That’s a resistor who’s value changes with temperature. Cut the wires to it and measure its resistance at a warm temperature. Then solder an ordinary resistor of that value across the wires. Save the thermistor in case you ever want to use the unit normally.

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