ST. JOSEPH, Mich. — Harding’s Markets, a 29-store chain based in Plainwell, Mich., has installed glass doors on an existing 24-foot deli case in a store here, and cut energy costs for the case by 81% during a 10-week test. The store metered the case and measured energy usage for five weeks prior to the installation of the doors, from Remis America, Elkhart, Ind., and for five weeks after installation. The average energy usage dropped from 91 kilowatt-hours per day to 17 kilowatt-hours per ...

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