I bought this unit because my neighbor, who has the same apartment size as mine has one an it cooled the entire apartment.  Mine doesn't I have not been able to cool my 2 bedrooms without using a fan to help pull the air in.  If I had kept the packaging I would return it.  Also my bill has increased from last year at 9.3 kWh to 15.7 kWh.  We are now in a hot spell and I have had to run it for most of the day and night and I am really worried about the bill for this next period.  I am glad I have it because it is better then no air at all.