(P)The all new Chill(R) Premier Inverter is ultra-quiet, adaptive and efficient comfort. State-of-the-art Precision Inverter(R) Technology provides efficient, precise temperature control and Library-Quiet(TM) sound levels, while convenience comes standard with simplified installation, and an adaptable design that allows the window to be opened, even after the unit is installed. Every Chill Premier Inverter model is a clever choice that delivers complete comfort and control.(/P)(BR) (BR)(B)Smart Design(/B)(BR)(P)Traditional window units don't allow the homeowner to open the windows once installed, limiting the amount of fresh air, but the Friedrich Chill (R) Premier Inverter features a flexible design that includes:(/P)(UL)(LI)SimpleSill(TM) Technology - Allows the window to be opened and closed after installation(/LI)(LI)Three-step Installation - Simplifies the process with a one-piece frame, included hardware and expandable side curtain(/LI)(/UL) (BR)(B)Variable Comfort Technology(/B)