The EU project MultiPACK supports the design, construction, installation and monitoring of reversible heat pump units using CO2 as the refrigerant, providing air conditioning, heating and domestic hot water. The design includes the use of two-phase ejectors and natural circulation evaporators to improve efficiency and can use both external air and water as heat source/sink. Two units were installed in Italian hotels to provide full energy services in a water/water configuration, or to provide cooling and domestic hot water in an air/water lay-out. After an extensive test campaign, data from the field is collected. This dataset includes necessary field data.