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Brand new units with air conditioning energy savings are scheduled to arrive in 2019,” he told The Washington Post, referring to the company’s flagship store on K Street.

“We’ll be able to go back to the day before we got them and see how much it would have cost us to heat that store, before and after the hvac services that installed them,” he added.

A spokesperson for Costco said they were able to meet their goals, but didn’t say how they achieved the savings.

“The company has implemented a number of strategies over the last several years that has resulted in the significant reductions in energy consumption and cooling costs of Costco stores,” spokesperson Amy Hirsch told The Washington Post.

“In addition to reducing energy consumption, Costco is now offering energy-saving refrigeration and air conditioning to approximately 6,000 of its stores worldwide, including more than 1,000 in the U.S. As a result of these energy-saving measures, we have been able to reduce the energy use of the warehouse by approximately 20%.