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

https://wiki-tonic.win/index.php/How_Do_I_Pick_Between_Wall_Mount,_Cassette,_and_Concealed_Duct_Mini_Splits%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