For 2026, top DIY cold-climate mini splits offer up to 24 SEER2 efficiency and...

https://smart-wiki.win/index.php/Do_Hyper_Heat_Mini_Splits_Actually_Work_at_-10%C2%B0F%3F

For 2026, top DIY cold-climate mini splits offer up to 24 SEER2 efficiency and operate down to -22°F. Expect savings of $1,500 to $3,000 on installation by handling setup yourself