In other words, convection ovens don’t care how reflective their contents are. That said, the shiny-versus-dull discrepancy does matter when it comes to certain special types of aluminum foil.

2. Use reflective foil behind radiators The second tip is to buy reflective foil for radiators on the outside walls of your home, which can be bought at your local home improvement store.

One hack people have been sharing is using aluminium foil - bought for just 65op from supermarkets such as Asda, Aldi and Tesco, to reflect heat back into the room behind a radiator.