In which I demonstrate how you can quickly and easily wire a window AC unit to a $100 thermostat to cool a cold room or resurrect a commercial fridge.

Here’s a link to the thermostat I used:

Here is a link to the AC unit I used (you may need a larger unit for a larger cold room):

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21 thoughts on “What coolbot doesn’t want you to know: How to save $250 on your cold room build!

  1. Gyges says:

    Nice video Rachel. Unfortunately, I was one of those guys in High School that pretty much skipped physics. That and I'm a hands-on, visual worker. Could you make a video that actually shows what you are doing? Your video is the only one like it I've been able to find and it would be really helpful to see what you are doing. If you've put together a .pdf since making this, I'd be willing to buy the plans as well. Thanks..

  2. Doug Schuldt says:

    I must be a dumb dumb. Cant seem to figure out wiring. Have same units. Do I remove yellow and red wires from fan from back of main switch and connect them to SF 104? The one I got came from Amazon and has a seperate power transformer. Is that where black and white power goes to unit?

  3. Daniel D'Agostino says:

    Wonderful video, thanks! I looked at a coolbot and realized it's just an overpriced raspberry pi with a few sensors and some very basic code. They are definitely price gouging unsuspecting people. Inkbird seems like another good option but I haven't compared them yet.

  4. Wite Powa says:

    I simply routed the temp sensor outside and stuck it in the condenser coils. So the sensor is always having hot air blown across it but not too hot and the evap coil never freezes but i can only get the temp down to about 40℉ which if perfect as I have the setup for my bedroom. Cost $0!

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