What is the range of depth of my window sill that the All-Weather 120V heat pump can support? February 11, 2025 14:57 Updated Please see this chart which shows the acceptable dimensions for the All-Weather 120V heat pump. Related articles What is the clearance required for proper airflow? What is the power supply requirement for the All-Weather 120V™ Window Heat Pump? How do I install my All-Weather 120V heat pump? What room size is the All-Weather 120V heat pump designed to cover? What temperatures can the All-Weather 120V heat pump operate in?