Electrocaloric effect (ECE)-based solid-state refrigeration technologies offer a viable substitute for conventional cooling systems. In recent years, breakthroughs in electrocaloric (EC) refrigeration technology have driven notable advancements in both the materials used and the devices created. Due to their unique properties, EC polymers are highly researched materials. They demonstrate remarkable performance in terms of temperature and entropy variation, operational temperature range, mechanical flexibility, low weight, and transparency. Numerous prototypes of EC devices utilizing EC polymers have already been documented. This chapter delves into the origins of the giant electrocaloric effect (ECE) in ferroelectric polymers. It also reviews recent research advancements in EC polymers, polymer-based devices, related materials, and their environmental impact. Finally, insights are provided on the research area.