Installing a mini split system yourself in the US can deliver substantial...

https://www.scribd.com/document/1013318156/Why-HVAC-Quotes-Are-So-High-A-Practical-Guide-for-DIY-Friendly-Homeowners-123814

Installing a mini split system yourself in the US can deliver substantial benefits—if you know what you're doing. First, DIY installation saves you a significant chunk of money, often thousands of dollars in labor costs