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

https://wiki-neon.win/index.php/What_is_a_Concealed_Duct_Mini_Split_and_When_Does_It_Make_Sense%3F

Thinking about a DIY mini split? These systems come with pre-charged R-454B quick-connect linesets, so you skip the vacuum pump and don’t need an EPA Section 608 license