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Proper heating, ventilation and air conditioning (HVAC ) system maintenance can increase occupant comfort, extend equipment life, and reduce energy consumption and operational costs. However, even properly maintained systems may still waste energy and cause occupant comfort issues if they are not operating consistently with the current use of the facility. By following the practice of periodically making adjustments and simple improvements to operational practices and control strategies, facilities can save up to 20% of HVAC energy consumption.