Space heaters heat you and the room they occupy in two ways: through radiant heat and convection. Radiant heat is like the warmth you feel when sunlight hits your skin. The closer you are to the space heater, the more of the radiant warmth you’ll feel. Convection happens when air surrounding the heater is heated. That hot air rises toward the ceiling, pulling surrounding cool air toward the heater, where that air is heated and also begins to rise. Air at the ceiling then begins to cool and fall, until it’s drawn toward the heater once again. This is called a convection loop, and while air toward the ceiling will tend to feel warmer, the convective loop will eventually help to heat the whole room.