Heat pumps are nowhere near as environmentally friendly as touted, MPs and boffins are claiming. They allege there's been a failure to address the powerful refrigerants used inside heat pumps, which can have a significant climate impact, hundreds of times greater than carbon dioxide, if released through leaks or a failure to maintain the technology.Some eggheads are warning the issue has received little public attention, despite refrigerant emissions being recognised by governments and regulators as an important source of greenhouse gases. Former Conservative leader Iain Duncan Smith and Greg Smith MP told the Daily Star the pumps are "damaging the…