The chapter investigates the pivotal role metaphors play in framing discourse, effectively acting as thermostats that amplify or dampen a message’s emotional and cognitive impact. This chapter illustrates how metaphors serve as powerful tools in the arsenal of communicators, allowing them to subtly influence public perception and behaviour by adjusting the ‘temperature’ of the conversation surrounding various issues. Through a detailed analysis of both historical and contemporary examples, the chapter reveals how strategically chosen metaphors have shaped political, social, and environmental narratives, cooling down potential controversies or heating interest and engagement. It explores the dual capacity of metaphors to clarify complex ideas and to obscure or distort reality, highlighting the fine line between enlightening explanation and manipulative rhetoric. The discussion underscores the ethical considerations inherent in the use of metaphors, prompting a reflection on the responsibility of speakers and writers to wield this tool judiciously. By demonstrating the significant impact metaphors have on framing and, by extension, on public discourse, the chapter calls for a more informed and critical approach to the language we encounter and use, advocating for a heightened awareness of the power of metaphors to shape our understanding of the world.