There are no requirements for a professional to install your new A/C system. However, air conditioners can be extremely expensive. Even the more affordable units can cost hundreds, if not thousands, of dollars. You don’t want to risk ruining your investment in a good A/C by messing up the installation.
It is also more efficient to have an HVAC expert install your A/C. They will have the tools, knowledge, and experience to get the job done quickly. A/C installation is really a job for the professionals.