Unfortunately have to give this device 1 star.  If it works, it does a reasonable job cooling a small space.  However, have had 2 of these units.  First one failed (stopped cooling) after 2 months, while the replacement unit made it through the first summer but now also doesn't cool anymore (lasted about 10 months).  Now outside the return/replacement window, so spent over $400 for one year of cooling.  Now have to find a new portable A/C.