Solstice^® 454B (R-454B) is a non-ozone depleting, zeotropic blend designed to serve as a lower GWP alternative to R-410A in reversible chillers and heat pump applications. A key feature of Solstice 454B is its 78% lower GWP (466), with improved efficiency and matching capacity to R-410A, that enables OEMs to transition their R-410A equipment to a lower GWP alternative conveniently. Solstice 454B discharge temperature is much lower than R-32, indicating that discharge temperature mitigation may not be required. Thanks to its higher critical temperature (77°C) and broader operating envelope in low evaporating temperatures, Solstice 454B outperforms other alternatives such as R-32 in heating applications.