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

https://scarlettsnewnews.nexorafield.com/posts/is-coiling-extra-copper-line-set-behind-the-condenser-a-problem

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