For 2026, the best DIY cold-climate mini splits deliver up to 24 SEER2...

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

For 2026, the best DIY cold-climate mini splits deliver up to 24 SEER2 efficiency and heat down to -22°F, keeping homes cozy all winter. Most units support 8-75 ft line sets, making installation flexible