Method for reducing the CO emissions of a gas turbine and gas turbine

A method for reducing CO emissions of a gas turbine (1) having a compressor (6), a turbine (10), and an air preheater (22) connected upstream of the compressor (6) is to allow technically simpler control without compromising the quality of CO emissions reduction. For this purpose, the heat transfer performance of the air preheater (22) is controlled on the basis of a minimum value for the inlet temperature of the compressor (4), wherein the minimum value is specified as a function of the absolute power of the gas turbine (1).