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The Building Performance Institute (BPI) is the nation's leading building science accreditation organization. The "house as a system" philosophy - which looks at a building's various components (building envelope, attic, basement, combustion equipment, ventilation sources) and the interrelationship between them to maximize a home's performance. This approach leads to greater energy efficiency, but perhaps more importantly to buildings that simply work better. A home that has been analyzed and upgraded from a whole-house position is more durable, healthier, more comfortable, and more energy efficient.