Mom's Hair Dryer is a gadget in The Bigg House, found after completing all quests in the Parent's Bedroom. It is a black hairdryer with pink switches and grill.
While the Hair dryer is one of the more useful objects in the game, it is also one of the most complicated. The simpler uses is as a heater that will melt or defrost blocks of ice and frozen objects. In this way, it can be seen as the opposite of the Sister's Desktop Fan. If plugged into an outlet and submerged in water, the hairdryer can start an electrical current which can be continued and is necessary for completion of some puzzles.