Get an infrared lamp, like the ones used for baby chickens. They're insanely efficient at heating water (ie: your body), just make sure to not leave it on when you're not there as they are a fire hazard if not properly secured.

250W in infrared lamp heats a person better than a 1500W electric coil space heater can in a shorter period of time due to direct transfer of energy.

[–] bluGill@fedia.io 5 points 1 week ago

The pipes are what you need to worry about. with theiright coat humans are fine to at least -40 bit the pipes freeze and break at much warmer.

[–] ciferecaNinjo@fedia.io 3 points 1 week ago

When I’ve got clothes layered on, what could use improvement is cold hands. I’m not going to type with gloves on but your suggestion could be a fix if I could mount a heat lamp above my keyboard but in a way that does not obstruct the screen.

(update) It has been done:
https://www.pcgamer.com/the-envavo-heatbuff-is-an-infra-red-lamp-to-keep-your-fingers-warm-as-you-play/