I was in the market for a portable ac recently and did humongous amount of research on features, specifications and price comparisons. One thing for sure is that Portable acs must have hoses to vent out to expel warm air. Without a hose the heat will be expelled indoors and reduce the impact of cold air in the room. One of the best I have found in the market is Plasma Cool portable PC-14E. It is easily portable on wheels, very strong – 14,000 BTUs cooling rooms upto 500 sq. ft., does not require draining, removes tons of moisture from air every day, looks ultra modern and best of all saves on electricity bills. I have been using it for about 4 months now, and everyone in my family has come to love this ac. You can find out more about this ac on www.plasmacoolportableac.com – one of the most honestly informative sites on this product out there. The website also has many testimonials that praise the product.