Thinking about installing a mini split system yourself? With pre-charged R-454B...

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

Thinking about installing a mini split system yourself? With pre-charged R-454B quick-connect linesets, you can skip the vacuum pump and the EPA Section 608 license hassle. The 9,000 and 12,000 BTU units plug into a standard 115V outlet