A vapor compression system comprising: - a first circuit to circulate a refrigerant comprising a first compressor, first condenser (26, 80) and first evaporator in fluid communication; a second circuit to circulate a refrigerant comprising a second compressor, second condenser (26, 82) and second evaporator in fluid communication; - both the first evaporator and the second evaporator exchanging heat with a process fluid in a common vessel; - at least one air moving device to circulate air through both the first condenser (26, 80) and the second condenser (26, 82); - the first condenser (26, 80) and the second condenser (26, 82) each comprising at least one substantially planar section; and - a condensing temperature of the refrigerant in the first condenser (26, 80) is different from a condensing temperature of the refrigerant in the second condenser (26, 82), whereby - the at least one substantially planar section of the first condenser (26, 80) being positioned next to and substantially parallel to the at least one substantially planar section of the second condenser (26, 82); the at least one substantially planar section of the first condenser (26, 80) and the at least one substantially planar section of the second condenser (26, 82) are positioned to have air circulated through the at least one substantially planar section of the first condenser (26, 80) and then through the at least one substantially planar section of the second condenser (26, 82); characterized in that: - the at least one substantially planar section of the first condenser (26, 80) and the at least one substantially planar section of the second condenser (26, 82) are separate, stacked coils, and the coils are round-tube plate-fin coils; and - the at least one substantially planar section of the first condenser (26, 80) is thermally separate from the at least one substantially planar section of the second condenser (26, 82) either via respective fins of the first condenser (26, 80) being split from respective fins of the second condenser (26, 82) to interrupt a conduction path there between or via inclusion of a thermal break, such as a slit, in common fins shared by the first condenser (26, 80) and the second condenser (26, 82) to limit conduction there between. - a first circuit to circulate a refrigerant comprising a first compressor, first condenser (26, 80) and first evaporator in fluid communication; a second circuit to circulate a refrigerant comprising a second compressor, second condenser (26, 82) and second evaporator in fluid communication; - both the first evaporator and the second evaporator exchanging heat with a process fluid in a common vessel; - at least one air moving device to circulate air through both the first condenser (26, 80) and the second condenser (26, 82); - the first condenser (26, 80) and the second condenser (26, 82) each comprising at least one substantially planar section; and - a condensing temperature of the refrigerant in the first condenser (26, 80) is different from a condensing temperature of the refrigerant in the second condenser (26, 82), - the at least one substantially planar section of the first condenser (26, 80) being positioned next to and substantially parallel to the at least one substantially planar section of the second condenser (26, 82); the at least one substantially planar section of the first condenser (26, 80) and the at least one substantially planar section of the second condenser (26, 82) are positioned to have air circulated through the at least one substantially planar section of the first condenser (26, 80) and then through the at least one substantially planar section of the second condenser (26, 82); characterized in that: - the at least one substantially planar section of the first condenser (26, 80) and the at least one substantially planar section of the second condenser (26, 82) are separate, stacked coils, and the coils are round-tube plate-fin coils; and - the at least one substantially planar section of the first condenser (26, 80) is thermally separate from the at least one substantially planar section of the second condenser (26, 82) either via respective fins of the first condenser (26, 80) being split from respective fins of the second condenser (26, 82) to interrupt a conduction path there between or via inclusion of a thermal break, such as a slit, in common fins shared by the first condenser (26, 80) and the second condenser (26, 82) to limit conduction there between. - the at least one substantially planar section of the first condenser (26, 80) and the at least one substantially planar section of the second condenser (26, 82) are separate, stacked coils, and the coils are round-tube plate-fin coils; and - the at least one substantially planar section of the first condenser (26, 80) is thermally separate from the at least one substantially planar section of the second condenser (26, 82) either via respective fins of the first condenser (26, 80) being split from respective fins of the second condenser (26, 82) to interrupt a conduction path there between or via inclusion of a thermal break, such as a slit, in common fins shared by the first condenser (26, 80) and the second condenser (26, 82) to limit conduction there between.