This 2026 DIY cold-climate mini split comparison looks at Zone Air and MRCOOL...

https://fun-wiki.win/index.php/Are_Custom-Cut_Precharged_Line_Sets_Actually_Safer_Long_Term%3F

This 2026 DIY cold-climate mini split comparison looks at Zone Air and MRCOOL for winter heat, kit parts, line length, wiring, and upkeep. One model is rated to -22°F; check its heating output at your local design temperature before you buy.