If the refrigerator fails in your home, you are out a little food and a little money. If the industrial walk-in cooler fails in your restaurant or grocery, you are out much more. You could lose thousands of dollars of food to spoilage. In addition, the income you could have generated if didn’t have to close your doors to repair the failure is lost forever. You have lost income, your employees have lost income, and you now have a large repair bill, assuming you do not have to spend thousands of dollars to replace your unit. If your freezer also fails, you are in a worse predicament.