The spring loaded style are easy to install and remove, and when removed they leave virtually no trace. This makes the sliding glass door an ideal place to install a pet door for a person who rents.
Temporary doors are generally spring loaded and require no cutting of the aluminum frame, so they are very easy to install. They lock with a simple and secure pin lock which requires drilling a hole through the top of the sliding door. Temporary doors can be screwed in if desired. The Thermo Panel 3e, Quick Panel 3, and Fast Fit panels are temporary pet doors. The video below details the installation procedure of a temporary door.
Semi-Permanent doors must be screwed into the door frame to lock, and use a more conventional hook and latch style lock. The Hale Standard panel and Ideal VIP are semi-permanent pet doors. The Hale dog doors will have their own lock that will mount about a foot above the existing latch. The VIP is the only door which uses your existing door lock. You remove the latches from the door jamb and install on the edge of the pet door. It makes for a nice final product, but the installation is a little more complicated as the latches have to line up.