You take an old gas tumble dryer like so... make sure the drum part of the dryer is functioning. Get rid of the gas radiator.
Then you place your old miner....
and hook that up to a raspberry pi
make sure the pi is well ventilated... but...
hook up the old miner to the tumble dryer like sooo,
When you have drying needs, just power up your miner and pi and point it to your favorite pool... while thats warming up place your close in your dryer...
You should get a nice steady flow of air that's about 50 c inside the tumble dryer... so you dry and maybe make some profit.
How would you re purpose your old miner?