Works fine, but for the wattage and amperage it's underpowered. Unit is 770 w and 6.8 amps at 5,000 BTUs and it draws air from in the room to cool the condenser flushing it outside... whereas similar window unit (Frigidaire) at 410 Watts 3.8 amps at 5,000 BTUs does not draw air from the room to cool the condenser, and is far more efficient at the same cost. It will work fine for about a hundred square feet but I would not recommend this unit just due to its inefficiency.