We burn as much oak as we can, and then we try to cut other hardwoods, because they burn longer, produce more BTU's at around 36.6 million BTU's per cord, compared to Pine, that burns at around 19.6 million BTU's per cord. When it is dry, it weighs in at about 1800lbs heavier than Pine per cord. It really is a great hardwood to burn, if it is well seasoned, but it does have that sour smell, like others have said here.
Do you have much of an issue with creosote burning pine, and firs? We use to live in Idaho, and Washington, and I know what you mean when you say that you have all fir trees. It was pretty rare to find good hardwoods in the mountains..