For 2026, the top cold-climate mini splits deliver solid heat down to -22°F...

https://wool-wiki.win/index.php/Zone_Air_vs_MRCOOL_for_a_2_Zone_Setup_I_Might_Expand_Later

For 2026, the top cold-climate mini splits deliver solid heat down to -22°F with efficiency ratings up to 24 SEER2. DIYers save $1,500 to $3,000 on installation by choosing units that support 8-75 ft line sets