22183Barriers to quantifying savings from controls changes

• Control parameters are almost always user-adjustable and will usually be fine-tuned during the life of the project, including the post-project measurement period.

• Control algorithms often include multiple variables which do not act independently. Consequently the effects on energy consumption often defy isolating and quantifying separately. An uncertainty is whether one measure will interact with another. In many cases, the aggregate savings may be less than the sum of the parts, in which case the savings would be over-stated if calculated independently.

• Control system improvements that improve quality, comfort, ventilation, or other features from some deficient state may actually increase energy use in some ways, eroding the overall savings of the measure itself.

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