The air conditioner comprises a
refrigerant radiator, the
refrigerant radiator comprises a heat conduction piece used for cooling a
power module, a
refrigerant heat dissipation cavity is formed in the heat conduction piece, and a refrigerant can be temporarily stored in the refrigerant heat dissipation cavity when entering the refrigerant heat dissipation cavity, so that the whole heat conduction piece is in a cooling state to uniformly cool the
power module; the heat dissipation capability is improved; and when the current temperature exceeds the starting temperature, the controller controls the on-off of the switching device according to the set duty ratio in the set time period, otherwise, the controller controls the switching device to be switched off, so that the heat dissipation efficiency is ensured, condensation is prevented, the condensation risk is reduced on the basis of improving the heat dissipation capability, and the safety is improved.