The HVAC industry is witnessing a transformative shift driven by the demand for higher energy efficiency, sustainability, and reduced environmental impact. As the world faces increasing challenges related to climate change and energy consumption, the need for innovative compressor technologies has never been more critical. This paper provides a review of relevant literature in the field of the most advanced and impactful innovations in the compressor market: oil-free compressor technology (OFC), variable speed compressor technology (VSC) and vapor injection (EVI) using refrigerants with low global warming potential (GWP), in the context of high efficiency HVAC systems. The study will focus on oil-free scroll and screw compressors which are not as widely used in the air conditioning HVAC industry. Additionally, the paper proposed a new bearing design which combines both ceramic and gas bearings is designed to adapt its operational mode based on varying load conditions, transitioning from partial to full load. A 1-D mathematical model built and integrated upon foundational models previously proposed in the literature. The model used to analyze bearing forces and lubrication clearances which give indication of required injected gas pressures in case of gas bearing operation beside analyze vapor injection optimum port size. Verification of the bearing forces and injection port sizes calculated in this work has been limited to comparison with theoretical literature and pervious research works. A thermodynamic model developed to evaluate a new novel application by combining the strengths of different scroll/screw compressor types with dual stage EVI in hybrid HVAC unit in term of cooling capacity and efficiency IPLV, particularly in different operation conditions.