Quote:
Originally Posted by jeff5may
Hack a window air conditioner and turn it into a heat pump. Beats the holy crap out of electric resistance heat.
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Or if modding is out of reach for you, just set the unit in the room with the hot side facing you. No modding needed whatsoever. It would then take the heat that's already in the room and "concentrate" it where you want it. Might work better if you could bypass the thermostat so it will keep working down to lower temperatures, but that's easily done in minutes with common tools.
Bitcoin or something similar might be a good choice if a heat pump is not an option. You can even make use of "unprofitable" used hardware - it just has to make enough to make it worthwhile.
And there's also the "low tech" reflector incandescent or halogen bulb...