Li-Mithra energy system is producing a quantity of heat energy at a temperature of service defined, production of domestic hot water or for the heating of the premises; It is associated with photovoltaic solar panels that are not developed by Li-Mithra. The technology consists of a heat pump specific (variable speed with control advanced compressor) coupled to photovoltaic panels fitted with a 3 mm thickness heat thermal aluminum exchangers/absorber positioned on the panel back face (against the backsheet/electrical isolator). The exchanger is linked to the backface panel by mechanical specific springs. The absorber/exchanger is a fine multichannel plate traversed by a fridge liquid which, on the face in contact with the backsheet collects the solar irradiating energy or the thermal effect of the rain or from the wind (thermal booster). The technology provide : Cooling down the photovoltaic panel in order to maintain or improve the electrical production Increase the heat pump cold source in order to improve the performances efficiency (COP)