Gas installers regard the journey to upskill in heat pumps to be complex and opaque. http://www.kyviet.vn/component/ngrabnews/?view=link&task=go&url=aHR0cHM6Ly9tYXJ0aW51c3Nlbi1jaGFybGVzLTIuYmxvZ2JyaWdodC5uZXQvdGhlLXVsdGltYXRlLWd1aWRlLXRvLWRyYWluLWNsZWFuaW5nLWFuZC1jZW50cmFsLWhlYXRpbmctYm9pbGVyLW1haW50ZW5hbmNl