Best Insulated Cat Doors

PetSafe Never Rust Wall Entry Pet Door - Telescoping Frame - Insulates Better Than Metal Doors, Energy Efficient Cat & Dog Door - Interior & Exterior Walls, Weatherproof, Easy to Install & Clean - L

PetSafe Extreme Weather Small Dog and Cat Door for Exterior Door - Energy Efficient Door for Cats and Dogs – Insulated Flap System – Small - Plastic Frame

Endura Flap Pet Door for Vinyl Sliding Glass Doors | Weatherproof & Insulated Dog Door for Vinyl Sliders | Durable with Secure Locking Cover | White, Small Flap, 77.25"-80.25" Slider Height

Endura Flap E2 Pet Door for Walls in White | Energy-Efficient Double Flap Design for Wall Installations | All-Weather Protection with Insulating Dual-Layer Flap | White, Large, Double Flap

Ideal Pet Products Designer Series Ruff-Weather Pet Door with Telescoping Frame, Extra Large, 9.75" x 17" Flap Size

Decormax Cat Door for Wall, Energy Efficient Pet Door with Steel Frame, Telescoping Tunnel, Double Magnetic Flaps and Two Sliding Lock Panels, Easy to Install, Milky White, Small

Perfect Pet The All-Weather Energy Efficient Dog Door, Extra Large, 9.75" x 17" Flap Size

PetSafe Exterior/Interior Cat Door - Big Cat 4-Way Locking Pet Door Flap for Large Cats - Tinted Privacy Door - Weatherproof, Durable Door Frame - DIY Easy Install with Hardware Kit Included

Endura Flap Single Flap Pet Door for Doors | All-Weather Insulated Flap | Durable Aluminum Frame with Secure Locking Cover | Interior and Exterior Door Installations | White, Small, Single Flap

Endura Flap Thermo Panel Dual-Pane Pet Door for Extreme Weather | Premium Insulated Pet Door Solution | Heavy-Duty, Secure, Weather-Resistant | Black, Medium Flap, 77.25"-80.25" Slider Height