<p>Renewable energy expert Ewan Frost-Pennington believes that like vultures – the star attraction at his Lake District home, Muncaster Castle – heat pumps are often painted under a bad light. Keep an open mind says Ewan as he tells Carole Annett how he convinced his parents to radically change their traditional thinking on heat and energy to transform the comfort levels, and coffers, of his ancestral home. </p><p><em>Sponsored by the </em><a href="https://www.gov.uk/government/organisations/department-for-energy-security-and-net-zero" target="_blank" rel="noopener noreferer"><em>Department for Energy Security and Net Zero</em></a><em>.</em></p>