Really great! Does a great job heating up a room we have above the garage which is really cold in winter. Though I bought it not knowing it needed to be hooked up to a window. And it’s annoying whenever the heats on the dehumidifier is on which makes no sense so you have to empty it out. But it is really big and bulky and didn’t fit well in the space where we had a window so we bought a Dyson heater instead... You can see the in the back.