All depends what you pay per ton. Also takes a bit different handling than a wood-fire.
I suspect most deaths from coal burning are from CO poisoning, whereas deaths related to wood-heat are from wood-fires. That's not based on any stats - just my own experience.
One pound of wood yields 7800 BTUs of heat. One pound of soft coal around 8800 BTUs. One pound of hard coal around 12,700 BTUs.
A full cord of dry soft maple weighs 3000 lbs. and yields around 19,000,000 BTUs of heat.
A full cord of dry red oak weighs 3700 lbs. and yields around 24,000,000 BTUs of heat.
A full cord of dry hickory weighs 4300 lbs. and yields around 28,000,000 BTUs of heat.
In my area, a full cord of firewood right now costs around $220.
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