Defrosting your fridge freezer is definitely worth doing. Fridge freezers are often the unnoticed guzzler of electricity in the home. They operate all day, all of the year and if they are covered in ice your electricity bills could increase by up to £50 per year. What’s more, an iced up freezer could be less effective at keeping your food sufficiently cold, which means it won’t be safe to keep frozen food for a long time.