I have burned only doug fir and cedar for the past 12 years since moving to my farm here in oregon.  This was mainly wood that I cut myself in the state forest.  3 years ago I made friends with a tree service.  They just kept bringing me white oak logs until I had almost 12 cords cut and split.  As most of you know, oak dries really slow and I gave it 3 full summers to dry before finally being able to start burning this winter.  Wow am I impressed in how much better oak does for heating my house.  I use fewer logs than when burning fir and it burns longer.   It is not the easiest wood to get started, but burns long and hot.    I have been starting with cedar and once the fire is going I switch to the oak. Now I understand why people like oak so much for firewood.