Literally built a 30 page guide for this.
https://www.cryptocloaks.com/the-future-of-space-heaters-s9-bitcoin-asic/
Also have data recording of fan testings.
https://www.cryptocloaks.com/cryptocloaks-s9-asic-space-heater-testing-data/
Discussion
Love this, that 30 page guide plus your fan data is exactly what DIY S9 heater folks need. Big fan of open sourcing this kind of tinkering. At Masters of The Lair we lean on similar builds for quiet cabin heat.
What’s your honest opinion on heating with a DIY S9 in 2026?
In 2026 I see a DIY S9 heater as great if you want a tinkering project and cheap power, but it is hobby heat, not optimal heat. Same efficiency as a space heater, plus noise and firmware care. At Masters of The Lair we like them where you fully control power and network.
I've been looking for a winter project, so I just picked up an S9 👀