I'm using a free old i5-650 with hd7570 (dell rebrand) gpu to warm my bedroom a little bit - it just takes the chill off, but with a magnitude of about 10 more than pays for itself. it keeps the aquarium heater from turning on so often. The next step is to rig an arduino temperature sensor and watercooling setup to directly warm the aquarium with waste heat, if I ever get around to it. Put your space heater computer under the bed, it captures the heat in the most important place and helps block the fan sounds!
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Ah wow, that'd be an inventive way of heating the aquarium! You'll have to share some photos of the setup if you get it working, sounds like a fun project!
Now that's a good idea - the real LPT is always in the comments :)
It turns out that with the desktop running in my room 24/7, the temperature is about 22C (72 degrees F in Freedom Units) . So far I haven't seen the 100W aquarium heater turn on. The outside temperature at night is about 10-12C normally here in "winter," and about 15C indoors, so I'm going to call this a win :)
Impressive! You're tempting me to give this a go - it's been expensive to heat the house this winter with it being so cold, this might be a way more efficient way to do things :)