Mamma Chang
John serviced my Subzero refrigerator and freezer, which are about 30 years old. His experience and knowledge are very apparent. He was capable of efficiently diagnosing issues and remedies. The repair process was easy and timely due to John's professionalism, accountability, and transparency. I highly recommend Certified Refrigeration. I will be keeping them on speed dial for any future issues with my Subzero products. Thank you, John!