Choosing a DIY mini split for 2026? MRCOOL brings 24 SEER2; Zone Air offers 23...

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Choosing a DIY mini split for 2026? MRCOOL brings 24 SEER2; Zone Air offers 23 SEER2. Pick MRCOOL for best value above -15°F, or Zone Air Hyper Heat if you need heat down to -22°F. Match the low-temperature range to your climate before you buy.