I realize this is old, but I don't need to create an artificial draft.
My chimney goes way beyond the roof line, and I have a barometric damper, which does probably let some heat escape up there regardless.
What I feel REALLY benefits me is a special cap on the chimney I bought online, it's called a vacu-stack. It creates an effect
which when the wind blows across it, what happens is instead of creating a backdraft, I get excellent draw!
I bought this a while back before we had some trees removed from next to the house, and when our chimney wasn't as tall.
Nearby trees will create a downdraft making some chimneys backup smoke into the house.
If you don't have good draft, check out the height of your chimney and possibly in relation to any nearby trees or other structures.
Before I added the vacu-stack and height, I was constantly going outside, taking off the clean-out cap, running an
extension cord outside, and running my hairdryer straight up, and also doing the paper lighting out there (also
did not have the barometric damper installed yet - I installed that too).