Abstract: A solar energy collector panel adapted to be mounted on a rooftop for heating air forced therethrough. The panel is rectangular in form and outwardly opens. A closure member is affixed to the outermost peripheral edge portion of the housing and forms a thermal barrier through which solar energy can travel into the interior of the housing, while thermal energy is restricted from traveling therefrom. The panel includes a plurality of parallel, adjacent, spaced-apart, series connected tunnels, each having a multiplicity of heat transfer members which absorb solar energy from the sun and dissipate thermal energy to air flowing thereacross. A blower pulls air from an outlet formed in the panel and directs the air into an enclosure. Cool air is received by an inlet formed in the panel and travels in series relationship through each of the tunnels so that thermal energy is transferred into the air as the air travels along a torturous path through the panel.