Westinghouse is the third brand of portable air conditioners I’ve purchased in the last 2 years.  It’s about a quarter size smaller, but more powerful, quieter and efficient of them all.  I wish I bought this first.  They all pretty much operate about the same, but the power and design of this one is of much better quality.  The added function of HEAT STRIP is what originally attracted me, but the efficiency and functionality of the Air Conditioner is noticeably better than the others.  Best of 3!