The Coolar system uses warm water that is easy to generate through solar energy and easy to store in a water tank. It does not use any moving parts, hazardous cooling fluids or lubricants. This way, the Coolar system can provide the cheapest, most durable and sustainable solution for vaccine, medicine and food storage in regions with unreliable or expensive electricity. Coolar’s system powers refrigerators that run independent from the electricity and instead with hot water from solar heat, which makes them close to carbon neutral. The refrigerator will enable doctors and health professionals to preserve lifesaving medicine and vaccines in a reliable and eco-friendly way.