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

https://franciscodmpm566.yousher.com/what-three-zone-mini-split-covers-up-to-1-800-sq-ft

Thinking about a DIY mini split? These systems come with pre-charged R-454B quick-connect linesets, so you skip the vacuum pump and avoid needing an EPA Section 608 license