Re: keep a small mining farm cool with only air conditioners.
you can't use mdf it is not water resistant.
can you get sheets of pond fabric?
can you get sheets of pond fabric?
We could use MDF inside, we have to build a second wall, it doesn't mean it needs to be outside the current wall, although technically, it would be easier to build outside.
Those pond fabrics seem like good sound insulators, they are high-density which is the most important element in soundproofing, will check to see if I can find them around, hopefully the price is reasonable.
That's incorrect:
Quote from: Solar irradiance - Wikipedia
The average annual solar radiation arriving at the top of the Earth's atmosphere is about 1361 W/m2.
On the surface of the earth, it's less. Depending on your location and time of day, most of the time it will be much less. So 235 kW is really a lot.Quote
Everyday, the sun beams to earth about 10,560 BTUs of energy per square foot.
source: https://www.extension.purdue.edu/extmedia/ae/ae-99.html#:~:text=Everyday%2C%20the%20sun%20beams%20to,available%20at%20the%20earth's%20surface.1 BTU = 0.293 watts
so 10,560 BTU = 3,094 W per square foot
1 square meter = 10.76 squer foot
3,094 * 10.76 = 33,291w
1kw = 1000w
33,291w = 33.291kw per square meter.
ya, a lot of that is lost along the way, but really, 0.25mw is not a lot as far as ambient is concerned, have you ever walked next to a hotel or a large building and felt that it was "strangely warm" in the street? ya standing on the exhaust side of the HVAC or near the external ACs units will be too hot, but just by walking around, it would be hard to tell if the building is consuming 1mw or none just by the "feel of it".
0.25mw is a lot of "heat" in a closed place if the size is not too large, but as far as the outside it's too tiny to be noticeable.
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Compare the 20 patio heaters 
what happens when you put 20 patio heaters inside the house and walk outside, are you still going to feel the heat? probably nothing much unless there is enough airflow forcing that heat to your direction, I have personal experience walking in and out of mining farms as large as 2MW, it's only warm at the exhaust side because heat is being pushed outside into that direction, walking around the other 3 walls you feel nothing.
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That solves all worries 
I was thinking of a small building in a crowded city.
I was thinking of a small building in a crowded city.I wouldn't be even attempting that in a crowded city, the nearest building is roughly 100m away.
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Does the noise come through the walls of the building, or does it reach the outside through the airco system? Or both?
We don't have the ACs in place yet, the noise is coming out the wall and more so from under the door, but sound travels in all directions so it goes through everything at different levels, there is at least a 20db drop between door open and close, but generally, it's not close to as quiet as we need it to be.