Acoustic noise level of household refrigerators has already become an essential quality index. Various noise control efforts contribute to enhance their quality in passive ways like damping materials, absorption materials and vibration isolators for relatively higher frequencies. The passive ways are however of limited use for lower frequencies. This thesis hence investigates the active control of the noise generated by the compressor and transmitted out of the machinery room of household refrigerators. The active control system is implemented based on the feedforward control strategy minimizing transmitted acoustic power through the ventilation openings of the machinery room. For the implementation of the controller using an FIR filter, firstly, the controller for minimization of the acoustic power is mathematically formulated. Secondly, the transfer functions required for implementation of the active controller are the measured. The controller is then obtained with the two design methods, e.g, frequency-domain design method and time-domain design method. Finally, the control performance is evaluated experimentally. It is found that the frequency domain design method has limitation due the variation of the primary transfer function with respect to time. The controller cannot achieve a reduction for the compressor at operation of refrigerator rpm while the controller achieves a reduction of about 3~10dB in sound pressure levels for the compressor at a constant rpm. at the peaks of the compressor noise. Alternatively, the controller is designed with the time domain design methods including FxLMS method. The controllers achieve a reduction of sound pressure levels even when the rpm of the compressor is fluctuating and also the transfer function of compressor is somehow changing with respect to time. It follows that the FxLMS method can work for the peaks at 408Hz and 459Hz with about 9dB and 17dB of reduction, respectively. Conclusively, the noise generated by compressors of household refrigerators and transmitted through the ventilation openings can be actively controlled with less influence of the variation of the primary transfer function by the time domain design of FIR filters for the controller.