A heat is taken from a photovoltaic panel (1) using air that flows through the photovoltaic panel (1) unit with an air cooler (2). The unit has an air intake opening (3) and an outtake vent (4) and the air flow is enforced by a natural draft of a chimney (5), to which the photovoltaic panel (1) unit is connected to. At least a part of the chimney (5) is exposed to solar radiation. Outtake vents (4) of several photovoltaic panel (1) units can lead to one chimney (5), preferably through thermal collectors (6) and piping. The air in the chimney is warmed up by solar radiation, the air ascends towards the chimney (5) mouth and the chimney (5) natural draft created in this way enforces air flow within the photovoltaic panel (1) unit. Even the air cooler (2) of the sucked air can form part of the system—preferably in the form of a ground-coupled heat exchanger (9). The chimney (5) can be equipped with heat-absorbing surface and it can also have a supporting wind device transforming wind energy into a natural draft within the chimney (5).