A gas heat pump system comprising: an air conditioning module including a compressor, an outdoor heat exchanger, an expansion device, an indoor heat exchanger and a refrigerant pipe; an engine module including an engine configured to burn a mixture of fuel and air and provide power for operation of the compressor; and a cooling module including a cooling water pump configured to generate flow of cooling water for cooling the engine and a cooling water pipe connected to the cooling water pump to guide flow of cooling water, wherein the engine module includes: a mixer configured to discharge the mixture of air and fuel to the engine; characterized in that the engine module further includes: a supercharger disposed between the mixer and the engine to compress the mixture discharged from the mixer and discharge the mixture to the engine; and an adjuster disposed between the supercharger and the engine to adjust an amount of compressed mixture supplied to the engine; wherein the cooling water pipe includes: a first cooling water pipe configured to guide the cooling water discharged from the cooling water pump to the engine; and a second cooling water pipe branched from the first cooling water pipe and passing through the supercharger, such that heat is exchanged between at least some cooling water and the supercharger; and wherein the second cooling water pipe is branched from the first cooling water pipe before the supercharger and combed with the first cooling water pipe after passing through the supercharger. an air conditioning module including a compressor, an outdoor heat exchanger, an expansion device, an indoor heat exchanger and a refrigerant pipe; an engine module including an engine configured to burn a mixture of fuel and air and provide power for operation of the compressor; and a cooling module including a cooling water pump configured to generate flow of cooling water for cooling the engine and a cooling water pipe connected to the cooling water pump to guide flow of cooling water, wherein the engine module includes: a mixer configured to discharge the mixture of air and fuel to the engine; characterized in that the engine module further includes: a supercharger disposed between the mixer and the engine to compress the mixture discharged from the mixer and discharge the mixture to the engine; and an adjuster disposed between the supercharger and the engine to adjust an amount of compressed mixture supplied to the engine; a mixer configured to discharge the mixture of air and fuel to the engine; characterized in that the engine module further includes: a supercharger disposed between the mixer and the engine to compress the mixture discharged from the mixer and discharge the mixture to the engine; and an adjuster disposed between the supercharger and the engine to adjust an amount of compressed mixture supplied to the engine; a supercharger disposed between the mixer and the engine to compress the mixture discharged from the mixer and discharge the mixture to the engine; and an adjuster disposed between the supercharger and the engine to adjust an amount of compressed mixture supplied to the engine; wherein the cooling water pipe includes: a first cooling water pipe configured to guide the cooling water discharged from the cooling water pump to the engine; and a second cooling water pipe branched from the first cooling water pipe and passing through the supercharger, such that heat is exchanged between at least some cooling water and the supercharger; and a first cooling water pipe configured to guide the cooling water discharged from the cooling water pump to the engine; and a second cooling water pipe branched from the first cooling water pipe and passing through the supercharger, such that heat is exchanged between at least some cooling water and the supercharger; and wherein the second cooling water pipe is branched from the first cooling water pipe before the supercharger and combed with the first cooling water pipe after passing through the supercharger.