I suspect that it will heat up faster but I also think that, if it does, it will probably be because it is a vertical forge. In a horizontal forge, the heat absorbing characteristics of the wool would have more effect than they would in a vertical because the heat in the chamber is reflected from the walls. With a vertical, the heat rises directly from the source ad is merely directed by the walls. In both cases, the walls absorb heat and multiple layers of wool supposedly worsens that situation to an extent that exceeds the benefit of having a smaller chamber. I guess we'll know when you measure your heat up time again...
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