Very efficient operation. Following the instructions, I set the temperature to 5-maximum, after 12 hours I had to reduce the control setting to 2.3 to maintain 31 degrees (as measured with my Taylor refrigerator/freezer thermometer), which is accurate. Very low noise level. I only wish the vegetable compartment was larger. I purchased this refrigerator to supplement the 20 year old model in my apartment. The landlord-provided refrigerator is well past the service life: leaks water into the vegetable crisper compartments, creating mold and soggy produce. A good investment for anyone seeking to enhance/replace an existing unit. I would recommend this product. It should also be quite suitable for dry-aging meat, my next project.