This upgrade dramatically increases your suit's ability to provide heat using the same energy, resulting in a much lower energy cost to keep the player's temperature at an adequate level. On the surface, this results in a 0.1/sec battery use rate without having to be near a Torch.
This item must remain in your inventory to function.
It is recommended to craft one before going into the cold caverns and below.
08 jan 2017: Updated to version 15.5 by Lovely Santa