A refrigerator appliance includes a cabinet with a liner spaced apart from a wrapper. A trim breaker is operably coupled with the liner and the wrapper. A trim adapter assembly is coupled with the trim breaker and includes an adapter member and a corner member. The trim breaker defines a forward receiving space and a protrusion of the trim adapter assembly is received by the forward receiving space. A heat loop assembly is operably coupled with the adapter member. The heat loop assembly includes a cover and a heat loop disposed between the cover and the trim breaker.