Important! Rocky Mountain Power’s wattsmart Starter Kit will no longer be available effective August 5, 2016. For questions or additional clarification, please email HES@rockymountainpower.net.

U-factor

U-Factor measures the heat transfer through a window and let's you know how well the product insulates. The lower the U-Factor, the greater resistance to heat flow (in and out) and the better its insulation value.

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