The MRCOOL MPH421HO13C VersaPro® 3.5 Ton Package Unit Heat Pump is an all-in-one outdoor HVAC system designed to provide efficient heating and cooling for residential and light commercial applications. Using R-454B refrigerant, it transfers heat between indoor and outdoor air through a refrigeration cycle, delivering cooling in warmer conditions and reversing operation for heating. Th... https://www.partshnc.com/mrcoolr-versapror-r-454b-package-heat-pump-mph421ho13c