Choosing a DIY mini split in 2026? MRCOOL offers 24 SEER2 efficiency and strong...

https://star-wiki.win/index.php/18,000_BTU_Mini_Split_for_700_Sq_Ft:_Does_That_Match_the_Rule_of_Thumb%3F

Choosing a DIY mini split in 2026? MRCOOL offers 24 SEER2 efficiency and strong value above -15°F. Zone Air’s 23 SEER2 Hyper Heat keeps heating down to -22°F—worth considering if deep-cold performance matters more than price.