Do I really need a three-prong outlet? December 03, 2024 17:14 Updated Yes, the All-Weather 120V heat pump requires a three-prong outlet. Related articles Are you developing a sliding window product? Can I use a three-prong adaptor? How loud is the All-Weather 120V heat pump during operation? How is this product any different than a mini-split? What is the airflow capacity of the All-Weather 120V heat pump?