I bought 2 of these & they cool over 1,500 sq ft easily. They are noisy when that compressor kicks in, but I'm used to a box fan's noise, so it doesn't bother me, even in the bedroom. Electric bill is a LOT less than the central air was, & they were 1/10 the cost of replacing my old central unit. I highly recommend & I'm very happy with the super cold air they put out. I run at 78 & it's perfect, even in our No Fl 100 degree days.  I'll see how efficient the heat mode is in a few months.