The AP14001HS EdgeStar Extreme Cool Dual Hose 14,000 BTU Portable Air Conditioner and Heater is one of the most powerful units on the market and is our top pick for larger spaces up to 525 square feet. Simply put, based on our independent testing and customer feedback, the EdgeStar AP14001HS Portable Air Conditioner offers the perfect combination of cooling power, quality, and style for larger spaces. We recommend this dual hose portable air conditioner as the best choice for cooling rooms from 400 - 525 square feet.. Here are the primary reasons the EdgeStar Extreme Cool units are not only in a class of their own, but are also the most popular units we offer: Another great feature of this portable air conditioner is that it is an environmental friendly unit - It meets new RoHS standards. RoHS, also known as the lead-free directive, stands for Restriction of Hazardous Substances. The goal of RoHS is to restrict the amount of certain toxins in electronic and electrical equipment such as lead, mercury, and cadmium. This restriction lessens the harmful impact these toxins can have on the environment and allows for the safer disposal and recycling of electronics and electrical equipment. Superior Engineering: Through quality construction and more durable internal components, the AP14000HS