Date,Step,Trigger,Citation
2006-01-23,13 SEER floor for split and packaged ACs and heat pumps (heat pumps 7.7 HSPF),Manufacture,"76 FR 37408, Table II.2"
2011-06-27,DOE direct final rule sets first regional standards for central ACs,Rule published,76 FR 37408
2011-10-25,2011 direct final rule takes effect (confirmed 2011-10-31),Effective,76 FR 67037
2015-01-01,"Split AC 13 SEER North, 14 SEER Southeast and Southwest; heat pumps 14 SEER / 8.2 HSPF",North: manufacture; South: installation,10 CFR 430.32(c)(1) to (3)
2016-07-01,End of DOE sell-through policy for pre-2015 units in the South; distributor records start,Enforcement discretion ends,81 FR 45387; 10 CFR 429.142
2016-07-14,Regional standards enforcement rule published (effective 2016-08-15),Rule published,81 FR 45387
2017-01-05,"Test procedure appendix M1 creates SEER2, EER2 and HSPF2",Rule published,82 FR 1426
2017-01-06,Direct final rule sets the 2023 SEER2 standards,Rule published,82 FR 1786
2017-05-08,2023 standards rule takes effect (confirmed 2017-05-26),Effective,82 FR 24211
2023-01-01,SEER2 floors apply; appendix M1 ratings mandatory,North and heat pumps: manufacture; South split AC and Southwest packaged AC: installation,10 CFR 430.32(c)(5) to (6)
2025-01-07,"Test procedure update adds appendix M2 (SCORE and SHORE metrics, not yet required)",Rule published,90 FR 1224
2025-07-07,Delayed effective date of the January 2025 test procedure rule,Effective,90 FR 21389
2025-09-09,Controls verification enforcement provisions pushed back one year,Rule published,90 FR 43367
2026-07-07,Controls verification provisions in 10 CFR 429.134(k)(4) apply; DOE proposes a revised Process Rule,Applies; proposal,10 CFR 429.134(k); 91 FR 42034