While this device is clearly audible, but not unpleasantly loud, though it heats very quickly. The dimensions of the device are pleasantly low, it can be so the 9-10 months a year, where it is not needed, easy to stow. And, this is the most pleasant surprise, the thermostat does what it should. While there is no temperature scale, only a setting of "brrr" to "sweat", but with some experimentation you get the ideal position out and then the part makes automatically and reliably what it should. I've had more than twice as expensive equipment, which definitely knew only the states on and off. If you couple the device with a simple switch, can thus be spaces reliably at certain times to a comfortable temperature (I use the heater for my amateur recording studio in the basement and have thus always when I go in the evening already pleasant conditions, without the all day needs to run everything). For the price you can not ask for more.