Tamsin Lishman, CEO of Kensa Group, discusses ground source heat pumps as a solution for decarbonizing domestic heating in the UK. They explore the efficiency and installation process of heat pumps, barriers to implementation, and the importance of policy signals and consumer choice. The chapter also highlights the challenges faced by Kensa, their partnerships, and Tamsin's experience as a female leader in the energy industry. They also touch on the benefits of geothermal energy for heating and cooling.