\u305d\u306e 2024 International Energy Conservation Code (IECC)<\/strong> addresses commercial ventilation largely by reference to ASHRAE 62.1-2022<\/a>. Because 62.1 already requires energy recovery on many large outdoor-air systems, IECC 2024 indirectly tightens ERV expectations, in Climate Zones 4 to 8 an energy recovery ventilator is commonly required where a system supplies more than about 1,000 CFM of outdoor air and the outdoor-air fraction exceeds roughly 30%.<\/p>\n On the residential side, IECC 2024 expands the HRV\/ERV mandate into Climate Zone 6<\/strong>, it was limited to CZ 7 and 8 in the 2021 edition. Balanced heat or energy recovery ventilation is now required in CZ 6, 7, and 8, with a minimum sensible effectiveness of 65% at rated continuous airflow in the coldest zones.<\/p>\n These provisions align US code with ASHRAE 90.1<\/a> and the EU EPBD zero-emission-building<\/a> trajectory, making energy recovery a default rather than an option.<\/p>\n For designers, the practical effect is that specifying an ERV is no longer a value-engineering cut but a code baseline in most cold and mixed climates. When modeling compliance under IECC, the recovered energy reduces the heating and cooling loads reported to the energy-cost budget, often improving the path to either the prescriptive or the performance compliance route. Pairing the ERV with balanced supply and exhaust also stabilizes space humidity compared with exhaust-only strategies. Owners should confirm that the selected device meets its rated effectiveness at the actual design airflow, because field airflow rarely equals catalog conditions; the enhanced commissioning rules in the 2024 edition exist precisely to catch that gap. In retrofit work, adding recovery to an existing make-up air unit is frequently the lowest-cost route to meeting the new ventilation-efficiency expectations.<\/p>\n When does IECC 2024 require an energy recovery ventilator?<\/strong> Does IECC 2024 require recovery in homes?<\/strong> What commissioning is required for ERV systems under IECC 2024?<\/strong> How does energy recovery affect IECC compliance modeling?<\/strong>Residential Provisions<\/h2>\n
Demand Control and Commissioning<\/h2>\n
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By reference to ASHRAE 62.1, an ERV is commonly required for systems supplying more than about 1,000 CFM of outdoor air with an outdoor-air fraction above roughly 30 percent, especially in Climate Zones 4 to 8.<\/p>\n
Yes, balanced heat or energy recovery ventilation is required in residential Climate Zones 6, 7, and 8, with a minimum sensible effectiveness of 65 percent at rated continuous airflow.<\/p>\n
Enhanced commissioning verifies airflow, sensor calibration, and control sequences for ventilation systems, especially those with demand-control ventilation and energy recovery, and duct-leakage testing is reinforced above 5,000 CFM.<\/p>\n
Recovered energy lowers the reported heating and cooling loads, improving the path to the prescriptive or performance compliance route and reducing the renewable or efficiency measures needed elsewhere.<\/p>\n