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

https://star-wiki.win/index.php/What_is_the_Cheapest_Zone_Air_DIY_Mini_Split_Right_Now%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