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This is selectively reported. From reading the actual document it’s apparent that the 77% discrepancy excluded the effect of both in-use factors (IUFs) and actual occupancy assessments (OAs). When Affinity Sutton included the Green Deal IUFs the 77% became 53%. Then they acknowledge that using an OA instead of 'standard occupancy' would further reduce the discrepancy, but they do not quantify it (presumably because they didn’t collect any actual occupancy data). Given the extent of under-heating in some poorly insulated homes, a 53% discrepancy wouldn’t surprise me at all – which is precisely why the OA is used for Green Deal.

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