Greetings,
A heater does not remove moisture it merely evaporates it. Once the temperature drops the moisture will condense on anything cold like the shed cladding, metal safes, rifle barrels etc. This is something you probably want to avoid. Also a metal shed in summer will be red hot in the heat of the day. This is tough on powder and will shorten its life, The idea of a small room, properly insulated, ventilated and damp proofed has considerable merit. You don't have to do the whole garage
Regards GPM.
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