To provide a floor heating system capable of using heat generated during driving of each apparatus such as an engine more efficiently.

The floor heating system is provided with the engine, a compressor driven by the engine, a heat exchanger carrying out heat exchange between a heat pump heating medium circulated by the compressor and a heating medium for heating, an evaporator taking heat into the heat pump heating medium cooled by the heat exchanger, and a circulating pump circulating the heating medium for heating heated by the heat exchanger with respect to a heating target floor. The engine and/or the compressor are housed along with the evaporator in a case having a heat retaining property, and heat stored in the case following driving of the engine and/or the compressor housed in the case is taken into the heat pump heating medium by the evaporator.