What is chaff?

As far as I'm aware, it's just the slang I've heard growers use for useless plant material when you're going specifically for seeds. Probably the most efficient way to harvest all of your seeds is to dry out your buds to an extreme point and then you just grind up that plant material and get the seeds out of it.

Another thought I had was using the heat output of my miner to help climatize a grow tent. Funny part is I used my tax return to get the miner.