Basic fan and the first 5 levels of radiator upgrades. (outdated)
Radiator is an upgrade to your Drill that adds more wattage. The first 4 levels of Radiator can be bought from the Drill Center. After the first 4 levels all upgrades are found in chests in the Mineshaft from 40km and below.
Radiator upgrades
Radiators available from the Drill Center:
Radiator upgrades available from Treasure chests
