During the conference you will get an overview concerning the state of the art, current developments in R&D, trends and perspectives in the field of air source heat pumps for retrofitting applications in urban areas.You will get detailed information on using air to air systems for heating, cooling and heat recovery as well as actual developments in the areas of improving the refrigeration cycle, comfort and acousticYou will be served with information concerning the technical state of the art of air to water heat pumps and challenges of the energy labellingYou will gain knowledge about the optimized design of a compressor for natural refrigerant for air source heat pumps You will be informed on the requirements for using natural refrigerants in heat pump applicationsYou will get detailed information on frameworks in the field of acoustics and acoustic characterization for air source heat pumpsProgrammeAir source heat pump applications VRV systems for big applications for heating, cooling and heat recoverytypes of VRV systemsapplication possibilitiescomfort & acoustics, sound emissionsfuture trends and possibilitiesbest practice Experiences with an Air-to-Air Heat Pump installed in a CastleBurg RabensteinNon-permanent HeatingSimulation & Initial Measurement Results Cold Climate and Retrofit applications for Air-to-Air Heat PumpsR&D trends and results in IEA HPP Annex 41Improvements of the refrigeration cycleA/A heat pumps with small duct, high velocity  air distribution system for retrofitting existing buildings Air source heat pumps on the test rig and in standardsTest results at 55°CEnergy labelling of space heating heat pumpsSeasonal efficiency in dependency on the bivalent pointOptimized compressor for air source heat pumps in retrofitting applicationsNatural refrigerantOil reductionEVIOptimal design pointCondensing unit applicationNatural refrigerants in heat pump applicationsCurrent situation and perspective (F-gas regulation)Requirements for using natural refrigerants (Standards, guidelines, experience…)Refrigerant charge minimizationOn-going researchAcoustics Framework for air source heat pumps in the field of acousticsSound designguidelinesrequirementstrends and future developmentAcoustic Characterisation of Air-to-Water Heat pumps - Measurement Equipment and Analysis Techniquesavailable measurement techniques & conceptsfrequency and spatial resolved acoustic signal analysisacoustic source localisation using an  acoustic camerapsychoacoustics and its implication in technical applicationslab demonstration of acoustic signal processing during icing of the evaporatorLab-tour: heat pump testing facilities and sound measurement equipment