The objective of the study “Development and Testing of Insulating Material from Natural Fibers for Refrigerator” was to develop a green and cost-effective insulation alternative to thermocol, or polyurethane foam, traditionally used for conventional insulation. The goal of the design was to use natural fibers such as coconut fibers, sisal fibers, and combine these fibers with some epoxy resin to develop composite insulation panels. Natural fibers are renewable, biodegradable and have low thermal resistance therefore they are a good application for refrigeration. The composites developed, were assessed for thermal conductivity, strength and durability, whilst compared to conventional materials. The results of the experimental study indicated that natural fiber composites are lower in thermal conductivity to insulate and reduce energy loss from refrigeration. The study illustrates that not only can natural fibers be used to develop sustainable insulation panels, but also they are of lower carbon footprint which is beneficial for the natural fiber industry. The study demonstrates that natural fiber composites can be an alternative green lightweight energy-efficient insulation with regards to thermal insulation applications.