Fixed air conditioners have an attached chassis that cannot be removed. This limits your installation options to windows only. Very common in both urban and suburban settings, fixed air conditioners make up for their lack of flexibility with quick and easy installation in most homes.
Slide-Out air conditioners have a chassis that can be removed. These units can be installed either in your window of through your wall. Slide-Out units tend to be easier to service because the removeable frame allows easier access to the unit.
Through the Wall air conditioners can only be installed in your home wall. These fixed mountings allow you to keep your windows free of an unsightly air conditioning unit, and offer the robust, high-powered performance that comes from a custom mount.