Ambient air temp 3 bbl

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It depends on what your ambient temperature is. Considering most brewers have a hard time keeping 5 gallon carboys cool, nearly 10x the volume will generate significant heat.
 
The room I have will be temperature controlled. I know after a certain size you need glycol. I've been told a couple times that 1.5 barrels can be cooled by ambient but higher than that cannot. Just looking to see if there's any truth to this?
 
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