At 32 degrees Farenheit, one pound of air has a volume of 12.4 cubic feet. While the volume will change at higher temps, for practicle purposes we can use that figure.

The specific heat of air, at constant pressure, is 0.240 Btus/pound.

So what you do is figure the volume of your shop. Take that number and divide it by 12.4 and your answer will be so many pounds of air.

Take the pounds of air that results from above and multiply it by the temp rise you want.

Take that number and multiply it by 0.240 and you have the required Btu's to do the job. Course, that's at 100% efficency, which no building is.

From memory, I think a gallon of fuel oil has a heat value of 140,000 Btus.

Hope that's of some help.

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