Ashi-Certified Inspector Britt B. sheds light on distinguishing an exterior heat pump. To determine if you have a heat pump, inspect the outside compressor unit. By peering down into the housing system, you can identify a crucial component: a brass, horizontal piece of pipe known as the reversing valve. This valve is instrumental in the heat pump's operation, facilitating the reversal of the refrigerant's flow for both cooling and heating functions. Recognizing the reversing valve confirms that the system is a heat pump, as this feature is unique to such systems. Inspector Britt B.'s insightful tip offers a straightforward way to ascertain the presence of a heat pump during your inspection, aiding in accurate assessments of HVAC systems.