WhisperKool Extreme WhisperKool XLT Koolspace Aquacool  WhisperKool Systems WhisperKool XLT The WhisperKool XLT series cooling units are through-wall systems designed to maintain temperature and humidity in a properly designed wine cellar. The series consists of five models for various cellar cooling load conditions. The WhisperKool XLT series is designed for very easy installation. There are very specific requirements for successful use of these products. Please contact your local Apex branch to find out more about these units. Our design consultants will be happy to assist you in determining if this is the right solution for your cellar. © 2005-2008 Apex Wine Cellars | CellarTec Services: (888) 999-9749 x 242 or email, M-F 7:00am to 4:00pm Pacific Time