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There are hardly any light switches in the new Oak Park Heights, MN City Hall. Energy-saving LED lights turn on only if a sensor detects motion, heat and sound; photometric sensors adjust indoor lighting to compensate for daylight. The new $6.5 million municipal building, which opened May 17, also features a state-of-the-art geothermal heating and cooling system, rain gardens and a heat-recovery system that reclaims energy from the air before it is discharged outside.
5/10 Pioneer Press