The Energy Saving Trust estimates that you could save up to £21 per year on your heating bill after you've insulated your loft.
Insulation will prevent heat seeping into your loft space, meaning the rooms in your home will stay warmer for longer.
An EPC rating shows how energy efficient your home is, and loft insulation will definitely improve it - especially useful when selling your home.
Reducing the amount of energy you use means less carbon is being released into the atmosphere, an easy way to help the environment.