Explaining Defrost in Heat Pumps Explaining Defrost in Heat Pumps Questions are often asked with regard to heat pumps and their requirement to defrost Hubands Energy / Thursday, 1 October 2020 0 3323 Article rating: 5.0 Questions are often asked with regard to heat pumps and their requirement to defrost. This document attempts to answer some of the most common questions. Answers are deliberately non-technical and do not cover specifics on any particular model, therefore some small allowances should be made for minor technical differences between units that can affect the way defrost is both initiated and then terminated. Read more