People who use your miners to heat. That's a straight idea since miners generate alot of heat, but How do you control the heat? Won't your miners overheat? Won't they get damaged? Using them to heat and still keeping the temperature between safe values could be complicated...
Termostats on the fans I used to draw air into and out of my place.
It's NOT really complicated, even if you have too much heat out of them.
If you don't have enough miner heat to keep your place warm by themselves, your regular heating system handles keeping the temperatures in the right range.
wmabern - try putting a fan blowing air INTO your register in the room with the miner(s) in it.
The ducting thing might cause enough of a fight between your central HVAC fan and the fans of the miners to cause the miners to not be able to cool enough due to their fans not being able to push enough air against the force of the HVAC fan when it's on.
*IF* your HVAC system has return air ductwork instead of relying on drawing through hallways and such, duct the output of the miners into the return air intake duct for their room - then the HVAC fan will be working WITH the miner fans to draw air through them.