Following the Consultation Forum meeting on 11 December 2023, with this paper, Eurovent provides preliminary comments on the Lot 21 review in relation to rooftop units, chillers, reversible heat pumps and VRF including: Adoption of new refrigerants in a short time creates uncertainty on the future efficiencies, a proposal for a new definition for Rooftop Units, a suggestion to include free cooling in the evaluation of energy efficiency, reversible heat pumps should have only info requirements on the cooling side in lot 1 for the time being, Heat recovery and simultaneous heating and cooling are important energy saving features also for VRF units, a suggestion to include Very High Temperature Process Chillers in the scope of the new Regulation.