[Greenbuilding] firewood moisture content - a question for Norbert perhaps

[Reuben Deumling]

Let us say I have a cord of firewood that registers 15% moisture content,
and a cord that registers 20% moisture, and one that registers 25%.

I burn the 15% cord and get XY BTUs/lb out of it.
I burn the 20% cord and almost certainly get fewer BTU/lb out of it, but
how much less usable heat?
And the same for the 25% cord?

Put more succinctly, what is the penalty for having firewood that is not
quite dry?

Thanks.

Reuben
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