A system may include a condenser unit including a compressor configured to receive a refrigerant from a condenser unit input port and provide a compressed refrigerant; a gas cooler configured to receive the compressed refrigerant and provide a first cooled refrigerant at a gas cooler discharge port; an expansion valve configured to receive the first cooled refrigerant and provide a second cooled refrigerant to a condenser unit discharge port; and a first controllable valve configured to receive the first cooled refrigerant and provide a first metered refrigerant combined with the second cooled refrigerant into a combined refrigerant provided to the condenser unit discharge port, the first controllable valve configured to selectively open when a first temperature at the gas cooler discharge port is below a first temperature threshold.