called ▁dangerous ▁woods ▁such ▁as ▁p ine ▁are ▁in ▁fact ▁sa fer ▁than ▁woods ▁such ▁as ▁o ak , ▁as ▁they ▁will ▁burn ▁hot ter ▁and ▁thus ▁help ▁keep ▁fl ue ▁temper atures ▁up , ▁and ▁their ▁fast ▁season ing ▁will ▁help ▁ensure ▁that ▁nov ice ▁wood ▁burn ers ▁are ▁burning ▁reason ably ▁dry ▁wood . ▁ ▁Mo ist ure ▁content ▁and ▁cre os ote ▁D ry ▁wood ▁produces ▁more ▁us able ▁heat ▁than ▁wet ▁wood , ▁since ▁the ▁energy ▁used ▁to ▁ev apor ate ▁the ▁water ▁from ▁the ▁wood ▁is ▁lost ▁up ▁the ▁chim ney . ▁F resh ly ▁cut ▁wood ▁( known ▁as ▁green ▁wood ) ▁has ▁a ▁high ▁mo ist ure ▁content . ▁D ifferent ▁wood ▁species ▁have ▁different ▁mo ist ure ▁contents , ▁which ▁also ▁vary ▁tree ▁to ▁tree . ▁Burn ing ▁fuel ▁that ▁is ▁mostly ▁water ▁uses ▁much ▁of ▁the ▁comb ust ion ▁energy ▁to ▁ev apor ate ▁the ▁water . ▁This ▁results ▁in ▁low ▁fire box ▁temper atures ▁and ▁low ▁fl ue ▁temper atures . ▁ ▁Fire wood ▁with ▁a ▁mo ist ure ▁content ▁below ▁ 2 0 ▁per ▁cent ▁by ▁weight ▁can ▁burn ▁efficiently . ▁ ▁This ▁is ▁the ▁" free " ▁mo ist ure ▁content ▁absor bed ▁in ▁the ▁wood ▁fib ers , ▁and ▁does ▁not ▁include ▁the ▁chem ically ▁bound ▁hydro gen ▁and ▁o xygen ▁content . ▁Mo ist ure ▁content ▁can ▁be ▁reduced ▁by ▁out door ▁air - d ry ing ▁(" season ing "), ▁for ▁a ▁period ▁of ▁several ▁months ▁in ▁summer