When should you first turn on your central AC for the summer does it have to be above sixty five degree for at least three days before turning it on?

You can turn on your central AC when outdoor temperatures consistently reach a level that makes indoor conditions uncomfortable, typically around 75 degrees Fahrenheit or higher. While there’s no strict rule about waiting for temperatures to be above 65 degrees for three days, doing so can help ensure that the system runs efficiently and effectively. It's also a good idea to perform a pre-season checkup to ensure the system is functioning properly.