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

https://alpha-wiki.win/index.php/Cooper_and_Hunter_HSPF2_13_vs_MRCOOL_HSPF2_10:_Real_Differences_for_Cold-Climate_Mini_Split_Buyers

For 2026, the best cold-climate mini splits deliver up to 24 SEER2 efficiency and reliable heating down to -22°F. DIYers save $1,500-$3,000 by skipping pro installs