Magnatron produces the Airtron AC Saver. They have won several prizes for innovation and savings from their produce.
Not a chance. My experience is no noticeable savings. Plus their installation instructions are ?<^$. They want to give the instructions over Skype.
Their customer service is as almost as bad as a sharp stick in the eye.
Other people make the same type of product just harder to find. Plus they have printed installation instructions.