The industry's fragile bottom line is lending weight to an emerging strategy of holding back from switching en masse to chlorine-free refrigerants. Two chains -- Jitney Jungle Stores of America, Jackson, Miss., and Hannaford Bros., Scarborough, Maine -- thus far have opted to completely change over to hydrofluorocarbons, or HFCs. But many other retailers, including Kroger Co., Cincinnati, are adopting a mixed strategy of using HFCs and chlorine-containing hydrochlorofluorocarbons, or HCFCs, ...

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