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A new solar heating and cooling system installed at Kellenberg Memorial High School is working so well it has saved the Catholic school in Uniondale, N.Y., about $12,000 in utility costs so far this year. “And that’s on the conservative side,” said Brother Gary Eck, who has taught math at Kellenberg for 16 years and is the school’s solar project coordinator. If it hadn’t been such a mild winter, he said, that figure would have jumped to $25,000 had the school needed the same amount of heat it used last year.