If you want to safely store perishable foods and save some money at the same time, you would need Nicolas Hubert's 'External Refrigerator. Nicolas Hubert's fridge is designed to use solar power to keep your food cool.
When temperatures drop, the External Refrigerator uses the chilly air to keep food cold. When it is sunny however, the solar panels on the fridge kick in to provide cooling. Nicolas Hubert's design would undoubtedly lead to cheaper electricity bills and cooler home designs.