In 2026, MRCOOL’s 24 SEER2 and Zone Air’s 23 SEER2 make this DIY mini split...

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In 2026, MRCOOL’s 24 SEER2 and Zone Air’s 23 SEER2 make this DIY mini split heat pump comparison a close call. Choose MRCOOL for better value above -15°F; pick Zone Air’s Hyper Heat for reliable heating down to -22°F all winter.