Thinking about a DIY mini split? These systems come with pre-charged R-454B...

https://post-wiki.win/index.php/What_Size_Mini_Split_for_a_900_Sq_Ft_Basement_or_Great_Room%3F

Thinking about a DIY mini split? These systems come with pre-charged R-454B quick-connect linesets, so there’s no need for a vacuum pump or an EPA Section 608 license