Small investor unrest is continuing inside Exergyn, a ground-breaking cleantech start-up. The DCU innovation based business has made big strides towards a climate change holy grail, an efficient emission-free heat pump that contains no refrigerants. But over 90 of its small investors who cumulatively have put over €5 million into the business have expressed concerns about the company’s strategy after the business has spent years solving many difficulties associated with its technology. Their fear is that their technology is about to be sold to Carrier Global, a US heating air-conditioning and refrigeration giant worth $36 billion, either too early or…

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