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The purpose of this addendum is to add a new set of test cases within new Section 7 of Standard 140. These test cases were adapted from HERS BESTEST, developed by the National Renewable Energy Laboratory.B-1 This set of test cases formally codifies the Tier 1 and Tier 2 Tests for certification of residential energy performance analysis tools, as described in the 2006 Mortgage Industry National Home Energy Rating Systems Standards.B-2