Whether you’re replacing an existing 27" air conditioner or just want the ultimate thru-the-wall unit, WallMaster is the perfect fit. Built with the finest commercial-grade materials and components, WallMaster is durable, yet quiet. Its solid-side sleeve assures maximum performance in thicker wall applications and gives you multiple installation options. Choose from cooling-only, cooling with electric heat or heat pump models. All WallMasters have a wireless remote plus convenient top-mount controls, a 24-hour programmable timer, an energy-efficient Money Saver® setting and other premium features.