Rough estimate is that one btu is enough energy to change the temperature of one pint of water, one degree over a period of one hour.
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Typically, use 5 * the volume in cubic feet to get BTU/hour for natural gas heaters. For this shop, that works out to 180,000 BTU/hr. Lower ceilings would make a big difference here...
pickles
35kW is 119,424.97 BTU/hr
102,000 BTU = 1 ccf
1 ton of cooling in 12,000 btu's