States across the region are setting ambitious heat pump targets to support their climate goals. But what will it look like to retrofit millions of homes with heat pumps as the primary heat source? This session explores efforts in Massachusetts to answer that question with applicable lessons for the entire region. In 2019, Mass Save launched a first-in-the-nation incentive for integrated controls that automatically transition between heat pumps and traditional heating systems. To complement this effort, MassCEC began a pilot to support whole-home heat pump systems with no fossil-fuel back-up. Come hear what both organizations have learned in the past year. Presenters will discuss the pros and cons of integrated controls versus full replacement.