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Building Code Board of Appeals <br />Packet <br />May 12, 2025 <br />Page 12 of 64 <br />Dwelling units with an average of 3,500 <br />square feet (325 m2) to 4,999 square feet 46 50 <br />(464 m2) of conditioned floor area <br />Dwelling units with greater than 5,000 square 42 46 <br />feet (325 m2) of conditioned floor area <br />Consistent with the themes in the other sections, <br />this adds an electric —preferred differential <br />(Cohort) and a home size differential (modified <br />from LECC). It also removes the requirement to get <br />credits for two or more categories if the full <br />credits can be met from either a really good <br />thermal envelope or a ground source heat pump. <br />(LECC) <br />[Strengthening from base and LECC] [Flexibility] <br />23.Section R408.2 Additional energy efficiency credit requirements is <br />amended to read as follows: <br />R408.2 Additional energy efficiency credit requirements. Residential <br />buildings shall earn not less than 1-0 the appropriate number of credits <br />indicated in Table R408.2.1, from not less than two measures specified in <br />Table R408.2.2. Five additional creak rncd for dwelling units <br />with moro thcn E,000 square feet (465 m2) of living space located above <br />grade plane. To earn credit as specified in Table R408.2.2 for the <br />applicable climate zone, each measure selected for compliance shall <br />comply with the applicable subsections of Section R408. Each dwelling <br />unit or sleeping unit shall comply with the selected measure to earn credit. <br />Interpolation of credits between measures shall not be permitted. <br />Exception: Residential buildings shall not be required to achieve credits <br />from two or more measures in Table R408.2.2 if sufficient credits can be <br />achieved to meet the requirements of this section from one of the following <br />single measures: <br />1. Achieving a 30% reduction in the total TC in accordance with <br />Section R408.2.1.1. <br />2. Installation of a around source heat pump in accordance with <br />Section R408.2.2 item number 1. <br />TABLE R408.2.1 ADDITIONAL ENERGY EFFICIENCY CREDIT <br />REQUIREMENTS <br />BUILDING SIZE <br />MIXED FUEL <br />CREDIT <br />REQUIREMENT <br />ALL -ELECTRIC <br />CREDIT <br />REQUIREMENT <br />