I was going to suggest to some here that have 220V 50 amp or so circuit in their shops - that they can get an electric hot water tank - a circulation pump - and a couple of "radiators" and build a simple closed loop hot water heat system in the shop. The tank doesn't take up much floor space - and some simple PEX or copper tubing and you could have some nice radiant heat.
When looking up some heat specs -- I found this INTERESTING table of BTU's required BY AREA... this is for heating a HOUSE - and calculates heat loss etc - but what I thought was interesting was the DIFFERENCE between areas of the country - and explains why I can keep my shop toasty warm just using my lighting (I live in the Pacific Northwest).
Rules of Thumb for Regions of the Country
New England, Upper Midwest, or Southern Ontario: 40 BTUH per square foot of floor area
New York City to Philadelphia: 40 BTUH
Philadelphia to Washington, DC: 35 BTUH
Seattle to Portland: 25 BTUH
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