The main objective of the project is the development of several reliable, safe, high efficiency and high capacity heat pumps working with the two most promising natural refrigerants: Hydrocarbons and 
CO2, together with a set of improved components and auxiliary devices adequate for the efficient and safe use of the two refrigerants. 
 
The project aims to reach a higher efficiency (10-20% SPF improvement) and lower Carbon footprint (20% lower TEWI) than the current state of the art HFCs/HFOs or Sorption heat pumps. The costs shall be very similar or slightly higher than the latter systems (10%). The project will also focus on the development of an efficient capacity modulation 
in order to enhance the integration capability with other renewable sources in the energy systems of Buildings and Industry. In this sense, if the project is successful, it will clearly bring a definitive step forward to overcome the barriers holding back the 
spread of natural refrigerants by proving that a new generation of heat pumps based on HCs and CO2 is perfectly feasible and commercially competitive.