A recent development in lower-carbon HVAC technology has addressed one of the key retrofit challenges associated with simultaneous four-pipe heat pump–chiller systems. The A-Combo R290 range can now deliver flow temperatures of up to 80°C, broadening its suitability for building upgrade schemes where higher flow temperatures are required. Addressing Existing https://purethermal.co.uk/media-news/retrofit-heat-pump-chiller-applications-with-80c-output-capability/