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

https://spencerssmartword.quillnesty.com/posts/zone-air-reviews-4.8-out-of-5-are-they-legit

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