The VH240 whole room heater is an effective way to reduce energy costs. This whole room heater has a thermostatic temperature control knob. Select your desired heat setting with a simple turn of the dial. Vornado's signature Vortex Whole Room Heat Circulation then distributes the warm air throughout the room. Unlike typical heaters whose hot coils create areas of extreme heat directly around the heater, the VH240 outputs a steady current of heat that envelopes the room in comfortable warmth. This heater is whisper-quiet and employs advanced safety features to provide worry-free use. A tip-over switch automatically cuts the heat and power to the unit if tipped over. With Vornado's unique design, theVH240+ outer casing remains cool enough to touch, even after hours of extended operation. The VH240 is backed by a 5-year limited warranty for season after season of worry-free warmth.