A vapor compression heat transfer system, comprising: a closed loop containing a working fluid comprising at least one fluoroolefin for circulation therein, said loop at least comprising in fluid communication, a dual-row evaporator, a compressor, a dual row condenser, and an intermediate heat exchanger. a) said dual-row evaporator comprising: i. a front row comprising sets of tubes configured for cross-current/counter-current flow aligned along a first axis and having a first inlet at a first end, and ii. a back row comprising sets of tubes configured for cross-current/counter-current flow aligned along said first axis and having a back row outlet adjacent said first end, said front row inlet and said back row outlet being arranged along a second axis orthogonal to said first axis, and a collector arranged along a third axis orthogonal to said first and second axes, b) said compressor having an inlet in fluid communication with said IHX and an outlet, c) said dual-row condenser having a back row with a top and bottom, a front row with a top and bottom, and a second inlet connected to the top of said back row and in fluid communication with said outlet of said IHX, said back row comprising first tubes for conveying said fluoroolefin working fluid composition along a fourth axis in a first direction to and through a conduit or a connection to a third inlet located at a top of said front row, said dual-row condenser front row comprising sets of second tubes arranged for flow in said first direction as well as a second opposite direction and a discharge outlet located at the bottom of the front row for discharging said fluoroolefin working fluid composition at a sub-cooled temperature, and d) said IHX comprising: i. a first tube having an inlet connected to said second end outlet end of said dual-row condenser and an outlet connected to and in flow communication with said first row inlet of said evaporator, and ii. a second tube having an inlet connected to said back row outlet of said evaporator, and an outlet connected to said compressor inlet, wherein said first and second tubes are in thermal contact with one another. a) said dual-row evaporator comprising: i. a front row comprising sets of tubes configured for cross-current/counter-current flow aligned along a first axis and having a first inlet at a first end, and ii. a back row comprising sets of tubes configured for cross-current/counter-current flow aligned along said first axis and having a back row outlet adjacent said first end, said front row inlet and said back row outlet being arranged along a second axis orthogonal to said first axis, and a collector arranged along a third axis orthogonal to said first and second axes, i. a front row comprising sets of tubes configured for cross-current/counter-current flow aligned along a first axis and having a first inlet at a first end, and ii. a back row comprising sets of tubes configured for cross-current/counter-current flow aligned along said first axis and having a back row outlet adjacent said first end, said front row inlet and said back row outlet being arranged along a second axis orthogonal to said first axis, and a collector arranged along a third axis orthogonal to said first and second axes, b) said compressor having an inlet in fluid communication with said IHX and an outlet, c) said dual-row condenser having a back row with a top and bottom, a front row with a top and bottom, and a second inlet connected to the top of said back row and in fluid communication with said outlet of said IHX, said back row comprising first tubes for conveying said fluoroolefin working fluid composition along a fourth axis in a first direction to and through a conduit or a connection to a third inlet located at a top of said front row, said dual-row condenser front row comprising sets of second tubes arranged for flow in said first direction as well as a second opposite direction and a discharge outlet located at the bottom of the front row for discharging said fluoroolefin working fluid composition at a sub-cooled temperature, and d) said IHX comprising: i. a first tube having an inlet connected to said second end outlet end of said dual-row condenser and an outlet connected to and in flow communication with said first row inlet of said evaporator, and ii. a second tube having an inlet connected to said back row outlet of said evaporator, and an outlet connected to said compressor inlet, wherein said first and second tubes are in thermal contact with one another. i. a first tube having an inlet connected to said second end outlet end of said dual-row condenser and an outlet connected to and in flow communication with said first row inlet of said evaporator, and ii. a second tube having an inlet connected to said back row outlet of said evaporator, and an outlet connected to said compressor inlet, wherein said first and second tubes are in thermal contact with one another.