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Using a CoolBot and a window or mini split air conditioner, you have all the cooling power you would need to construct your own cold storage room. Compared to conventional systems, the CoolBot-driven cooler will save you up to 83% in upfront costs, eliminate expensive repair technicians, and reduce your electric bills up to 42%  Available right here at Cornerstone Farms, you can build your own walk in cooler or trailer. Since 2006, the CoolBot has been helping folks construct affordable cold storage units for: fruits & vegetables, home-brewing/ tap rooms, wine cellars, cheese caves, floral coolers, and wild game/ meat processing. A CoolBot powered system stores and protects your items at the temperature you set from 34 - 59F. The CoolBot works with air conditioners from 6,000 to 24,500 BTU and mini splits from 9,000 to 36,000 BTU. Join 45,000 satisfied CoolBot customers and build your own walk in cooler today.

  • Digital display allows for precise temperature adjustments
  • Works with a window air conditioner or mini split air conditioner (sold separately) and an insulated room or enclosure to create a walk-in cooler
  • Installs in minutes; no tools or electrical knowledge required
  • Remembers your temperature setting even after a power failure

I know, I know it sounds too good to be true! We have had 3 installed here locally and have had no problems with them.

How It Works

“Normal” walk-in cooler compressors sell for $2500 + installation – which in our area is another $1000, not including electrical. They use a “brute-force” approach to cooling: using LOTS of coolant (which is bad for the environment), a big motor, lots of surface area and multiple fans (which dry out your vegetables and end up accounting for up to 60% of the cost of operating electricity.).

Here's the crazy thing: that $2500+ walk-in cooler compressor you see on a small 8' x 8' vegetable cooler may only put out 8,500 BTUs of cooling power! That's less than you get from a $300 window air conditioner from Home Depot!

It's not quite that simple, though. Here's the problem with window air conditioner units. First, they are electronically limited so that you can't go below 60 degrees. With some electrical bravery and skill, you could snip, solder and bypass the electrical controls so you COULD go lower. It will work better, but still not very well, because while BTU's are BTU's (it's a strict measure of cooling/heating capacity), your ability to actually ACCESS that cooling power drops drastically as you approach only 60° F. This is because you don't have the fans and extra surface area built into normal walk-in cooler compressor/condensor/evaporator units which dissipate the cold without freezing up.

That's where CoolBot comes in! CoolBot uses new patented technology to replace the brute force approach of fans and surface area with a micro-controller "brain" that intelligently interfaces with your air conditioner - controlling and coordinating its output so that you can access nearly all your cooling power, even as you keep temperatures in your walk-in cooler (or any highly insulated room) in the 30's without re-wiring and without any freeze-ups.

The CoolBot is NOT just a thermostat. The CoolBot uses multiple sensors and a programmed micro-controller to direct your air conditioner's compressor to operate in a such a way that you can run at whatever temperature you want without ever freezing up. And our innovative interface linking the CoolBot controller to your air conditioner allows for 2-minute installations without any training, cutting, soldering or even taping.

The multiple sensors and microcontroller allows the CoolBot to work even during the heat of summer and even when people are opening and closing the door all day long and EVEN if they accidentally leave the door open! (Obviously CoolBot can't get you down to temperature if the door is left open for hours, but it can do the best it can without freezing up the fins of the air conditioner so that when you DO close the door, you'll be able to quickly recover to the right temperature.

CoolBot cannot give you 100% use of the listed BTUs on your air conditioner. You need to buy a 10,000 btu a/c unit even when you could have gotten away with an 8,000 btu walk-in cooler compressor (and we would encourage people to get a 12,000 btu unit. It's not necessary, but it's nice to have the extra power). The price of even a large a/c unit is still a fraction of the cost of a real walk-in cooler compressor.

Most importantly, when it can't access your BTUs of cooling power, CoolBot is programmed to shut off the compressor on your A/C unit, so you do not pay for electricity to make BTUs that you can't use! That saves you money and helps the environment. As long as you sized your air conditioner correctly, you'll have no problem keeping your room as cold as you want it to be.

Here's a chart showing the size of A/C unit we ideally recommend to cool a well-insulated room. (Meaning you have at least 4" of Styrofoam in walls, ceiling and floor which is the "industry standard" for walk-in coolers).


Dimensions of CoolerSize of A/C Unit
6' x 8' 10,000 BTU
8' x 8' 12,000 BTU
8' x 10' 15,000 BTU
8' x 12' 18,000 BTU
10' x 12' 21,000 BTU
10' x 14' 25,000 BTU

 Brands that we have learned do NOT work well with CoolBot

  • Emerson: (all the models tested so far have metal temperature sensors).
  • Whirlpool: Such a terrific old American brand, but these do NOT work with CoolBots due to electrical problems so far. The compressor seems solid, but just can't make them work. Haven't tried recently.
  • Goldstar: Cheap LG-owned Brand. These are a bad choice for multiple reasons.
  • WESTPOINT: A bad choice. We can only get them to cool down to about 47 degrees.
  • PerfectAire: A horrible, horrible, choice. We won't do tech support for anyone that tries to use the coolbot with this brand. If it works for a while, that's great, but otherwise we can't support it.

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