We housed our bottle babies in the white calf hutches....ya' know, look like little houses with a vent in the top and a window with a drop door on the side, and an big opening in front that sat on the ground.
Now keep in mind, we're in Texas.
That said, I started raking leaves when they started to fall at the beginning of autumn. That's what I used for bedding when the temps dropped down to a point that I knew they needed the extra warmth. I'd put 2 huge trash bags full of those leaves in the hutches and those calves would burrow down in them. The reason I used the leaves instead of hay? The cost, but they worked good. And, there wasn't any dust.
Where you are...pine chip bedding, straw? I dunno. There is cost involved, I know.
Alice