Installing a Window A/C Unit Outside a Shed

I have a shed with extremely small windows that I use mostly for storage, but I do have a small area with a work-bench, etc. I also have a window-mount air-conditioner that I received from a friend basically free (on a trade). The unit is probably old, but my friend said it hadn't been used much. This is not an evaporative cooler, by the way. It's a regular, 220-Volt air conditioner.
I'm planning on building a stand for it (out of treated lumber) next to an outside wall of the shed and even putting a little roof over it. Then I'll route the air through the wall of the shed using a round air duct(s) -- Maybe use an 8 or 10-inch duct(s), I guess.
I'm a complete novice with A/C and the front bezel is missing from the air-conditioner, so I'm not sure exactly how it works. I assume that the top area of the unit intakes air and the bottom outputs air. So, I'm wondering if I need two separate ducts or if I can simply run everything through one duct? If I use two separate ducts, does it matter if the ducts are physically close together inside the shed? Could I simply set it up to suck air from outside the shed and then open a window?
The air conditioner is much, much larger than what I actually need. It's rated at 28000 BTU and the shed is about 300 square feet with open rafters and very little insulation and 4 small air vents in the roof. I don't use the shed a lot, maybe 20 or 30 hours a year. So, the electric bill isn't an issue. In the hot weather, like we're having now though, the shed gets close to 100 degrees, So, I would like to be able to cool it and cool it off fast when I do need to do a small project, etc.
I'm guessing I'll have to go down to the local sheet-metal shop and have something fabricated, but I'm wondering if I might be able to simply make something out of canvas and PVC pipe, for instance. The A/ C unit will be behind the shed where it doesn't show, so it doesn't matter if the setup looks a little bit kludgy.
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Why not just cut a window for the unit?
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Un-B-Fucking-Lievable
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Somebody's a trollin or just really fuquering dumb. Anybody knows that all you need is cardboard, duct tape, bailing wire and bubble gum. Bubba

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i think it would be much easier to just cut a hole in the wall and mount the unit
your trying to reinvent the wheel ,

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That's an unusual approach but I think it would work if you use 2 separate ducts similar in size to the inlet and outlet areas of the unit and make them reasonably short. I am not going to address the efficiency, safety, practicality, adviseability, or other aspects of your idea.
Don Young
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Thanks Don.
In doing some Google searching, I found this old post:
---------------------------------------------------------------- "Adding ducts to an AC window unit . . . if you will get with G/E and Whirlpool and you will find out they have a duct adaptor kits to tie on to window units on 16K, 24K , and 29k window units to use duct work on the units to use in commercial applications. Also even Sears has a adapter kit for the 24K & 29K window unit to be put on trailor houses. Now of course my sheet metal man can make them cheaper than buying them . . . about 5 years ago I did a job with 3 G/E 29K window units and did have to order the duct kits to install them and get the pattern for my sheetmetal man to look at and start making our own duct adaptor kits. . ." ----------------------------------------------------------
So, it does look like this sort of thing has been done before.
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Mg you started with mouse and now you are after the ELEPHANT good luck

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Are you fucking serious. BWWWWWWWAAAAAAAAAAAHHHHHHHHHAAAAAAAAAAAAA!!!!!!!!!!!!
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man that would cool one 10 times that big you mite pipe the cold air in and use a filtered out side air for the return O would cut a ho;le in the shed and WALL MOUNT IT ii just did that with a 18k on my 20-40 bed room installed a header and all and 2 by 4's all used 3 2 by 4s and 6 foot of 2 by 6 at header cut in 1/2 or less safe male

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Let's see, you use the shed an average of 2 hrs. per month. It's hot in there about three months? So you're going to go to all this trouble so you'll be a little more comfortable for six hours per year? At any rate, I'd make sure it works (and learn how it works) before you start in with the custom mounting.
I'm sure the resident AC experts on here will fill you in on the details of how to do the 9000 hours of calculations and measurements that are required before you use an air conditioner. If you skip those, your shed will blow up, and your balls will shrivel up and fall off.
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wrote:

Your shed has 220 in it already? If not, running that out there, even on a fabricated extension cord you unroll each time, would cost more than buying a 100-buck baby 110v unit at an end-of-summer sale, and putting it in an existing window, or cutting a hole in wall and framing a shelf for it. I'd sell the free unit for scrap metal. Without a faceplate, it is basically worthless, unless somebody has a matching one that died. (I am assuming you are in north america with 110v mains, right?)
aem sends...
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That's good advice on checking it. As it turnrd out it didn't work. The worst part was getting the damned thing into my utility trailer and hauling it off to the dump. I don't know what that old thing weighed, but I'd guess a couple hundred pounds or more. I wound up putting two, 12000 BTU portables in there that were on sale at Circuit City. I put one right next to a work table and the other one right next to my work bench. They work pretty well.

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