Check genesis mining, they are cheaper than gaw

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It's easier to get the heat out, try to find a really powerful  extractor that extracts 20-30 times the amount (m3) of the room. Also it uses less electricity than ac.
We used an extractor of 3250 m3, our miners (5 * 30 mhs Zeus &  bitmain s2) transport like 1800m3. It uses only 500 watt at maximum and we use it at 75% capacity.
In the Netherlands the extractors are called softbox try to Google it.