Non-pfas refrigerants and methods of cooling electronics

A method of heating and/or cooling of electronic components, articles and/or devices during the manufacture and/or operation thereof comprising:

• providing an electronic component, article or device which is being manufactured and/or being operated for its intended purpose;
• and
• transferring heat to and/or from said electronic component, article and/or device during at least a portion of said manufacturing and/or operating process by directly or indirectly transferring heat between said electronic component, article and/or device using a refrigerant comprising at least one of cis-1,1,2,3,4,4-hexafluorobut-2-ene, trans-1,1,2,3,4,4-hexafluorobut-2-ene, cis-1,2,3,3,4,4-hexafluorobut-1-ene and trans-1,2,3,3,4,4-hexafluorobut-1-ene.