In 2026, the top DIY cold-climate mini splits hit efficiency ratings up to 24...

https://evelynsexpertcolumns.brightsora.com/posts/zone-air-vs-mrcool-line-set-design-which-is-safer-long-term

In 2026, the top DIY cold-climate mini splits hit efficiency ratings up to 24 SEER2 and operate reliably down to -22°F. Most systems support line sets from 8 to 75 feet, perfect for varied layouts