At the Hotel Infantas de León we are very aware of the care of the environment. Therefore, and thanks to the financial support of the European Union through the NextGenerationEU fund, a replacement of the gas boiler and chiller that the hotel had for its air conditioning has been executed by a cascade of aerothermal heat pumps for the generation of cold and heat, feeding an inertial tank that acts as a buffer tank that will replace both the boiler and the chiller.