Every food retailer is familiar with the cost of refrigeration. Keeping fresh foods chilled and frozen foods frozen in a busy shopping environment adds up quickly on a commercial power bill. And, there are hidden costs as well. Refrigerant leaks can be particularly damaging to the atmosphere's ozone layer, which helps filter the sun's ultraviolet radiation. Some of the worst offenders, such as R22 refrigerants, are being phased out under the terms of international treaties, but the U.S. ...

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