The length of time required for an AC replacement can vary depending on a number of issues, including the size and complexity of the system, the type of installation, and any unforeseen problems that occur during the installation process.
The removal of the existing unit, which can take several hours, is the first step in an AC replacement. The installation of the new unit follows, which could take several more hours. Any required ductwork alterations, electrical work, or other system upgrades could take more time.
The timing of the installation and the equipment's availability can both affect how long it takes to replace an AC. To obtain an accurate estimate, it is best to speak with a qualified HVAC technician.