His setup is relatively simple. Low-power electric heaters suspended above a mountain meadow heat the ground and the plant life beneath, three degrees warmer than the surrounding area.
Earlier that day, I'd asked Ali to set up the kursi for us--which was basically an electric heater under a low table covered with a thick, quilted blanket.
Some people have, in addition to a heating system in their houses, electric heaters that they put in individual rooms when they want just one room to be warmer than another.
Rosetta's components had to be kept warm by onboard electric heaters to avoid damage from the harsh environment of space, however, its batteries were never designed to run by themselves for long.