One of the challenges for a Mars habitat is for it to maintain suitable temperatures in the right places in a habitat.[1] Things like electronics and lights generate heat that rises in the air, even as there are extreme temperature fluctuation outside.[8][25] There can be large temperature swings on Mars, for example at the equator it may reach 70 degrees F (20 degrees C) in the daytime but then go down to minus 100 degrees F (−73 C) at night.[26]