For 2026 DIY cold-climate mini splits, expect models with efficiency up to 24...

https://emmasnewjournal.talesignal.com/posts/what-refrigerant-should-i-buy-in-2026-r-454b-vs-r-410a

For 2026 DIY cold-climate mini splits, expect models with efficiency up to 24 SEER2 and reliable heating down to -22°F. Line set lengths range 8 to 75 feet, letting you customize installs