Used the AC unit for the first time yesterday and it worked great cooling off a large upstairs room with high vaulted ceiling. Located in Northern California with all day direct Sun the room would reach 70-80 on hot days with all solar curtains closed. The unit is made for a smaller room however it seems to cool the large room quite nicely. However, do not use the unit for 24 hours after receiving as the coolant needs to settle in the upright position after being shipped from who knows where. Very important to follow this instruction for best cooling results.