This thesis presents an in-depth investigation into the performance of a novel integrated back pass solar collector (BPSC) system, including the monitoring of a full scale BPSC over two years. BPSC are special type of heat exchangers that absorb incident solar radiation, and convert it to useful thermal energy via a photothermal process. In a BPSC, the absorber transfers the energy from the solar irradiance to the air flowing through the collector by forced convection. This heated air inside the collector is then transported as circulating air directly into the building space.