Where did you build it that the rent is $300?
its a small space that is unused in a friends small business. I just pay a little bit of 'rent' and covcer the power costs of what i am using.
In the bigger picture, its a testbed where I can scale to 15-20kW before moving to a much larger space
Is this the current collective site?
to an extent. the collective concept was more geared towards a facility with 20kW+ capacity and with bitcoin miners being more expensive (ie: fewer).
This location has 18kW available to me, but I don't know whether the AC can handle that much added heat in a limited area, and I suspect that it may be difficult to go above 10-12Kw during the summer, and with 6kW in place by mid-april, it leaves much less space for hosting options until I move to a larger location or can actually use 18kW or more without heat limitations
If it is a question of the small area, just get a big fan. That will help with hotspots anyway. Obviously if the AC in the entire space is at capacity you will still need to limit your power load.
^Thats my concern. Airflow is pretty good, it actually has a reasonable updraft through the grated flooring of cooler air from the storage area below. this blows through the miners into the rest of the area - so local exhaust is not an issue
The concern is the 600V Air Conditioning system which is dispersed through the entire warehouse area and the office area. Its not known whether the AC will be capable of
1) Cooling the warehouse area with the miners without creating extremely cold conditions in the office area
2) cooling over 18kW of heat from the mining rigs.
I know just how much heat comes from 6kW. since ive installed it the gas heater went from firing up 5min every 15min to 5 min every 30min. Its entirely conceivable that the maximum power i can use without disrupting the overall climate control will be 10-12kW during the heat of summer - but without finding out what the exact system setup/specs are (i doubt anyone in the business would now, since its part of a multi-business plaza) i may have to wait and see while building up the collection as i can.
Unfortunately, there is no real ability for me to access the outside to install secondary cooling/ventilation paths from my location so the AC is probably the limit
) 
) out soon...