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I used to use assessor data and google earth to find a home's BAS, unfortunately Energy Upgrade California QAQC inspectors usually find additional square footage in homes. Both contractors and homeowners are baffled by this, but in order to participate in the program we have to use their measurements. On more than one occasion customers have stopped the project before it starts because of a fear that their property taxes will be re-assessed based on Utility 3rd party QAQC additional square footage findings. BE CAREFUL!