Our 420 sq ft bedroom in in the lower level of a split-level home and it tends to stay about 5-7 degrees cooler than the main level. We'll turn this heater on about 30 minutes before we go to bed and it will have the room warmed up a few degrees by the time we get down there. The built-in thermostat might be off a little bit because if we set it at 64 it will keep the room at 70. Not a big deal once we figured it out but the first night it got too warm in there! Overall, I think this was well worth the money. It's compact and the wireless remote makes it easy to adjust the temperature without getting out of bed.

This Optimus heater is super powerful and is infrared radiant with an accurate remote control and outperforms any competition like the Honeywell infrared radiant heater my cousin owns and the Lasko infrared radiant heater at his job. Go with Optimus heaters cause they are of superior quality to any other brand. If you like ceramic heaters and that's what you're into then stick to it but I guarantee you that you don't know what you are missing out on with this heater

We needed something for our basement during the cold months to help with heating. Its around 800 square feet and this did the trick. It puts out quite the punch!

Works as promised but a bit noisy; I like the variable speeds.

Used in Class A RV and heater kept the unit comfortable. The only negative item with the heater is the thermostat is 5 degrees low. If you want 70 degrees room temperature you have to set heater thermostat to 65 degrees.