HVAC techs are in such high demand, they can charge exorbitant rates to install/service, that its not in their interest to service them, or even install them.

It took me a while to find a company to install a mini split I purchased on my own, and I paid $$ for labor. This was only because I didn't have the time.

That said, mini splits are so cheap (sub $500) that its easier to just purchase a new one than repair.