An air conditioning system comprising: a refrigerant circuit including: an indoor heat exchanger, an outdoor heat exchanger, a compressor; a four way valve configured to serve to change the connection of the refrigerant circuit to switch the air conditioning system from a cooling mode to a heating mode, or conversely; a refrigerant discharge pipe connected to the compressor and forming at least part of the refrigerant circuit, the refrigerant discharge pipe being connected to the discharge port of the compressor and serves to guide the compressed refrigerant that is discharged out of the compressor toward the four way valve; an electrical circuit configured to drive the refrigerant circuit; wherein the refrigerant circuit further includes: a first pressure stat and a second pressure stat, which are mounted on the refrigerant discharge pipe at a first connection portion and a second connection portion, respectively; the first pressure stat configured to detect pressure of the refrigerant in the refrigerant discharge pipe; and the second pressure stat configured to detect the pressure of the refrigerant in the refrigerant discharge pipe; wherein the first pressure stat includes: a first pressure sensor having a first pressure threshold; and a first electrical switch configured to stop the electrical circuit from driving the refrigerant circuit at least partially in accordance with the pressure detected by the first pressure sensor; the second pressure stat includes: a second pressure sensor having a second pressure threshold; and a second electrical switch configured to stop the electrical circuit from driving the refrigerant circuit at least partially in accordance with the pressure detected by the second pressure sensor; and the first pressure threshold is different from the second pressure threshold. a refrigerant circuit including: an indoor heat exchanger, an outdoor heat exchanger, a compressor; a four way valve configured to serve to change the connection of the refrigerant circuit to switch the air conditioning system from a cooling mode to a heating mode, or conversely; a refrigerant discharge pipe connected to the compressor and forming at least part of the refrigerant circuit, the refrigerant discharge pipe being connected to the discharge port of the compressor and serves to guide the compressed refrigerant that is discharged out of the compressor toward the four way valve; an electrical circuit configured to drive the refrigerant circuit; wherein the refrigerant circuit further includes: a first pressure stat and a second pressure stat, which are mounted on the refrigerant discharge pipe at a first connection portion and a second connection portion, respectively; the first pressure stat configured to detect pressure of the refrigerant in the refrigerant discharge pipe; and the second pressure stat configured to detect the pressure of the refrigerant in the refrigerant discharge pipe; an indoor heat exchanger, an outdoor heat exchanger, a compressor; a four way valve configured to serve to change the connection of the refrigerant circuit to switch the air conditioning system from a cooling mode to a heating mode, or conversely; a refrigerant discharge pipe connected to the compressor and forming at least part of the refrigerant circuit, the refrigerant discharge pipe being connected to the discharge port of the compressor and serves to guide the compressed refrigerant that is discharged out of the compressor toward the four way valve; an electrical circuit configured to drive the refrigerant circuit; wherein the refrigerant circuit further includes: a first pressure stat and a second pressure stat, which are mounted on the refrigerant discharge pipe at a first connection portion and a second connection portion, respectively; the first pressure stat configured to detect pressure of the refrigerant in the refrigerant discharge pipe; and the second pressure stat configured to detect the pressure of the refrigerant in the refrigerant discharge pipe; a first pressure stat and a second pressure stat, which are mounted on the refrigerant discharge pipe at a first connection portion and a second connection portion, respectively; the first pressure stat configured to detect pressure of the refrigerant in the refrigerant discharge pipe; and the second pressure stat configured to detect the pressure of the refrigerant in the refrigerant discharge pipe; wherein the first pressure stat includes: a first pressure sensor having a first pressure threshold; and a first electrical switch configured to stop the electrical circuit from driving the refrigerant circuit at least partially in accordance with the pressure detected by the first pressure sensor; a first pressure sensor having a first pressure threshold; and a first electrical switch configured to stop the electrical circuit from driving the refrigerant circuit at least partially in accordance with the pressure detected by the first pressure sensor; the second pressure stat includes: a second pressure sensor having a second pressure threshold; and a second electrical switch configured to stop the electrical circuit from driving the refrigerant circuit at least partially in accordance with the pressure detected by the second pressure sensor; and a second pressure sensor having a second pressure threshold; and a second electrical switch configured to stop the electrical circuit from driving the refrigerant circuit at least partially in accordance with the pressure detected by the second pressure sensor; and the first pressure threshold is different from the second pressure threshold.