Try a truly infrared heat lamp. No headache-inducing visible light, but lots of radiant warmth.
I often mention the 100w one I've got mounted below my monitors in my office.
Didn't end up using it at all last winter as the 100 watt server keeps the office warm. In the summer I shuffle the server into the basement. Getting close to needing to shuffle it back upstairs again.
I am interested to build a new mid-tower PC though, emphasising compute efficiency. My aim is an average 40w consumption. Every continuous watt I run amounts to about $1 a year in electricity. 60 watt reduction saves me $60 every year.
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