This document presents an experimental study on the impact of a top glass cover on the thermal performance of a Cylindrical Parabolic Solar Collector (CPC) air heater. A copper receiver tube coated with black copper is used as the concentrating solar collector. Experiments are conducted with and without a 5mm thick glass top cover on the CPC. Results show that using a top cover can achieve an instantaneous efficiency of 60% for the CPC solar air heater, indicating that a top cover improves the thermal performance. The document provides details on the experimental setup, measurement instruments, operating conditions, and theoretical equations used to analyze the thermal performance of the CPC air heater with and without a top cover.