This is a way to stay warm during the cold months and nights. Instead of using a 1500 watt space heater, use a 60 watt lightbulb, and a blanket draped over your desk. The bulb provides heat as well as indirect light.

This mimics a Japanese "kotatsu", or a space heater that burns charcoal, and is located under a table.

This setup is pretty comfortable down to around 40 degrees F. The energy use is dramatically lower (less than 1/20th the energy of the space heater).