Are a quick and easy way to install a cat door or dog door in your sash window without permanent changes to your home. No tools are required for installation due to the spring-mechanism, designed to allow to to install or remove the pet door within minutes! This pet door is perfect for renters or vacation homes. The energy efficient flap and the dual paned glass provides excellent insulation to keep the cold or heat from entering your home.
If you have a sash window that slides up and down, you can install the Thermo-Sash 3e™ Sash Window Pet Door!