A TikTok video has divided opinion online after one man shared a video of how to prevent energy being wasted by simply using tin foil to insulate your radiatorsMan shares 68p energy hack to save money on heating A TikTok user has shared a cheap tip to save money on your energy bills this winter – with nothing but a roll of tin foil. Carl Alexis, from Swansea, heard the tip from his grandmother years ago but it wasn’t until the recent rise in energy bills that he remembered it. The IT worker uploaded a video on TikTok of him using a layer of tin foil between the radiator and wall – with the idea being that it reflects heat back into a room He said: ‘I was looking for ways to conserve energy due to the rising costs.