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DIY walk-in cooler...on the cheap!

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    DIY walk-in cooler...on the cheap!

    For a couple years now, I've seen the need for us to have a large cooler of sorts at our lease. I've wanted to get a walk-in cooler for some time, but no one else has ever wanted to pitch in any money to go searching for one, even a used one. Seems $1k+ is too much for all the cheapsters I hunt with! 😉

    I've had the idea of how to build one in my head for a while now, so when I ran across a deal on some 5x7 wooden storage boxes for sale ($100 ea) I decided to jump and work this out on my own. They are 7'-0 tall.

    Boxes in their past life...

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    I picked up 4 of them. 2 are going to another lease member to start a blind build - he's shooting for a 7x10 blind.
    Luckily, these stack really nicely so it was easy to transport all four home in one trip.

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    Along the way, I ran across six 4" x 10' used cooler panels that I plan to use for insulation purposes - these were free (someone's "significant other" was very inclined to see them disappear quickly)!

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    Even by myself, it wasn't too hard to get the beginnings of the box stood up. I'm adding in some stud walls to build in some support. The boxes by themselves won't hold a lot of vertical load from the top down. My plan to use 2x3s for the wall supports, and cut "recessed channels" into the foam panels. That way the foam panels can sit down into the studs and fill in the gaps better, without a major loss in interior floor space. I'll get some good pics of what I'm talking about as I get there.

    So far I'm only a week into this build, but I plan to take it out and set it up at the lease at the end of this month. I've got some work to do!

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    Overall plan for cooling this thing is a 5000 BTU window air conditioner, which should get it down into the low 40s to high 30s. We have a couple of those things lying around. I will also be cheaping-out and "building" my own version of the CoolBot system. That should be less than $80 if I have my math figured out right, but I don't have the parts for the system just yet. Final interior dimensions should be 4'-4" x 7'-4" (32 sf & 233 cuft).



    Currently, I have $130 in the wall stud framing. I know my stud spacing on the two side walls is quite close (and most likely overkill), but they will be supporting all of the hanging loads. I will be using a 4x4 across the ceiling to hang from and it will be anchored into the side wall framing. I'll be cutting a door out of the original box skin and insulating that. Then just need to find some cheap "oops" paint from a box store or something cheap at Habitat.

    I'll post more pics as I get further along.

    #2
    Looks awesome so far. Do you mind sharing more about the DIY cool bot?

    Comment


      #3
      Here is a link to the control unit used in the video I posted above...



      Here is the manual temp gauge I'll use to verify inside temperatures...



      There are tons of videos on using window units for cooler setups, but not quite as many on how to control the system beyond use of a $300+ CoolBot unit.
      The above linked video (so far) has been the best one I've found that gives a lot of explanation on the controller works to run the system. That UTuber has other videos where he shows some of the setup on using that specific controller.

      A few other videos for you to watch...









      Comment


        #4
        Thanks for sharing more details. I'm in the same situation where I'm building a room for hanging meat, but I was expecting to pay the $300+ for the cool bot.

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          #5
          Yeah, once you understand exactly how the CoolBot works & how it tricks the AC unit, it doesn’t make a lot of $ense to spend that kind of money. You can piece together the working components for a fraction of the cost.

          Comment


            #6
            I’m needing to build one also. Been thinking about using a wood shipping container or a 5 x8 enclosed trailer. If I use a wood container I would have to skin it since it will be outside. Will follow this thread. Thanks for putting this up.

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              #7
              Great info. I plan on building one at my new place soon. The lease last year had the Coolbot system.
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                #8
                Tagged!

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                  #9
                  Very Nice!

                  Comment


                    #10
                    tagged

                    Comment


                      #11
                      Originally posted by kmack View Post
                      cut "recessed channels" into the foam panels. That way the foam panels can sit down into the studs and fill in the gaps better, without a major loss in interior floor space. I'll get some good pics of what I'm talking about as I get there.
                      Getting a little further along in the build.
                      I was able to get some of the foam panels cut for placement in the walls. And I also got the final wall (w/door and AC location) framed up and placed. Since this is kind of a "resto-mod" build, I'm building the inside structure with the outside skin in place. Sounds weird, but it seems the easiest way to make things work. In doing this, finishing up the fourth wall panel required me to remove one of the side panels so that I had access to the inside in order to cut out the door opening. It works. I'm holding off on cutting out the AC opening until I verify the actual dimensions of the unit we will be using. The framing for the opening is there and installed using pocket-hole connections.

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                      As for the foam panels, this is what I was talking about with making cuts so that the panel sits "recessed" into the wall. The panels are 4" thick am I'm trying to make the most of available interior square footage. It's a bit of a PITA to do it this way and makes a huge mess, but it works.

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                      Doing it this way, I effectively only lose 1.5" of floor space on each wall.

                      I still have more work to do, but we decided to go ahead and get it all loaded on the trailer yesterday in preparation for hauling it out to the lease this weekend. I'll finish out the remaining foam panels out at the lease and get some pics as we get further along. Hoping to also have some AC going while I work on it! The controller should be here in two days.

                      Oh, I added another $59 in miscellaneous costs this weekend (more screws, 2 gals of Habitat paint, and some paving stones to support it on the ground).

                      Comment


                        #12
                        Adding another video with a better explanation for how to hook up the STC-3008 control unit to control the AC unit.

                        Part 1


                        Part 2


                        I currently have the cooler built at the lease. Still have to finish installing all of the insulation into the walls, though. The 5k BTU AC unit I plan to use is at the house and I'll be getting it and the controller fully set up so that I can install it into the cooler (ready to go) next month.
                        Last edited by kmack; 04-07-2025, 02:56 PM.

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                          #13
                          Looks great! We built a walk-in game cooler out of an old closet in our pole barn. It was already framed with a concrete floor. All we had to do was spray foam it and then install the thick foam panels and it's worked pretty good. Our biggest issue is that it faces West so the sun hits it all afternoon making it hard to get below 38-40F so we've found that if we can keep that sun off of it that it can easily get to 35F. Keep up the great work!

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                            #14
                            Thanks for sharing all of the details. I hope to go this route when I install one!

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                              #15
                              I know it will work with the 5000btu ac, but I would go bigger.
                              8-10btu. Opening and closing door will let out a lot of cool air. That 5000btu will be working overtime to catch up. I’ve built a couple of these and that’s what I’ve observed.

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