Installing a central HVAC system is a complex task, which is why it's always in your best interest to hire a professional, licensed technician to complete the job.
First, an HVAC installation technician
will determine the size of the system needed, and then, they will measure the space that it needs to fit in. This ensures that the system will not be too large or too small for the space. Next, the technician will install the new equipment and make sure all the components are properly connected. If a system replacement is required, the technician will remove the existing system and install the new one. This includes checking all connections and making sure the system is level and securely mounted.