I pulled apart an old refridgerator and I mean old, got it regassed and ran the pipes over the cpus and inside the case. First draw back was condensation on the insde of the case walls, solved with case fans turned round to pull air out of the case. Second drawback is power, I couldn't find a smaller compressor / pump that was rated for freon so it cost a small fortune to run.

I have solar heating in my house and wondering if it would be possible to run the "cold" return pipes across the heatsinks give my central heating an extra boost in the winter