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Galletti HiRef HPS which is reversible and air cooled for colder climates. This low-noise model will heat water to 58°C from an ambient temperature of anything down to -15°C. The reversible nature of this unit caters for multiple applications and a swift defrosting cycle. Alternatively, the Hydrofluro-Olefin (HFO) driven Galletti HiRef TVX achieves cooling from lower outside temperatures, known as Free-Cooling, by utilising large heat exchangers in a V-formation. For smaller commercial and residential applications we have Galletti MPE and MPI DC Air to Water Chillers and Heat Pumps. Both produce chilled water even if the outside temperature is higher than 50°C. The Smart Defrost facility is available in the ranges to ensure ice build-up on the compressor is kept on top of and removed as soon as a drop in efficiency is detected by the sensors. Finally the Galletti SCX 80 – 360 kW Outdoor Packaged Unit gives the choice to install scroll compressors in a tandem or trio configuration on the same cooling circuit, improving efficiency at partial loads. Air conditioning systems run at below full load conditions for the majority of their operational lifespan.