FIREWOOD: Species BTU ratings?

[I Fell]

Can someone provide me with a breakdown on the "bang for the buck" regarding BTU's of various species of wood (for heating a house).
I know I really like fir, but it would be nice to know the whole spectrum from bad to good, including the amount of residual ash left behind.

(Pacific Northwest)

Fir, Birch, Alder, Arbutus, Oak, Pine......etc?

Thanks

 

[che]

This is one from my 'favorites'...

tree species characteristics

 

[che]

There's a discussion in the chainsaw forum also:

firewood thread

 

[ozy365]

Awesome site, Che. I didn't ask the question, but thanks for answering it.