Vornado MVH vortex small to medium room space heater with three heat settings (low, medium, high) that also adjust energy consumption and seven thermostat settings. This is best for a small to medium room where it does a great job on the low or medium settings. I tried it on a larger room a few times but it was fairly ineffective (but then so was the rooms insulation and window and door sealing so I really couldn't keep that room warm with any of the space heaters I tried). I used it inconsistently for one winter and it did a great job in a 15 feet by 20 feet room even on the lowest heat setting. Used for part of one winter.