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What is the sum of the individual heat losses of a structure known as?

  1. External loss

  2. Internal gain

  3. Envelope load

  4. Structure loss

The correct answer is: Envelope load

The sum of the individual heat losses of a structure is known as "envelope load" because it refers to the total amount of heat that is lost or gained through the structure's walls, roof, windows, and doors. Option A, "external loss," is incorrect because it only refers to one component of the structure's total heat loss. Option B, "internal gain," is incorrect because it refers to the amount of heat gained from internal sources such as people, appliances, or lights, rather than the total heat loss of the structure. Option D, "structure loss," is incorrect because it does not accurately describe the heat lost through the structure's envelope. Therefore, option C, "envelope load," is the most accurate and specific term for the sum of individual heat losses of a structure.