This is one of the smallest units available, you must use it in a small room: 100-200sqft. This unit will struggle to cool down a 250 sqft room at an outside temp of 100 degrees with moderate humidity, it never reached below 80. It will do a good job of cooling down a 400 sqft room to 78 degrees with an outside air temp of 88 degrees within a few hours. The temperature of the cooling air leaving the unit can get as low as 55 degrees to start but will taper up to 65 degrees after 24 hours with an outside air temperature of 100 and moderate humidity. I recommend using this directionally: have it blow directly onto the person or area you need to be a few degrees cooler. This will not get you through the highest temps above 100 degrees for a room of 250sqft or larger but it does a good job when the workload is light. It is loud.