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Results default to exact AHRI-certified combinations, DOE regional SEER2/EER2 minimums, and sub-700-GWP refrigerant. EPA's May 2026 rule retains an exception for pre-2025 high-GWP system inventory; California separately prohibits ≥750-GWP new equipment. Verify the certificate, date labels, local code, Manual J, and Manual S with a licensed contractor.