When can I buy the Gradient? July 07, 2023 21:33 Updated The Gradient is currently in-stock and available for sale on our website. Related articles How much will the Gradient cost? What is the Combined Energy Efficiency Ratio (CEER) rating of the All-Weather 120V window heat pump? How wide can my windows be? How is the Gradient heat pump different from other heat pumps? Aren’t all AC’s heat pumps? Will the Gradient be available outside of the US?