Reviews: energy-efficient pet door

Dog

for Walls | Clear Vinyl Dog & Cat Flap for Wall Installations | Durable & Rust-Free Aluminum Frame | White, XL, Double Flap

A heavy-duty aluminum wall pet door with a clear vinyl double flap, magnetic seals, and a 16-gauge steel locking cover. Excellent for families who want visibility for timid pets and a weatherproof seal.

Doors, Gates & Ramps

Endura Flap Pet Door for Walls in Black | Energy-Efficient Single Flap Design for Wall Installations | All-Weather Protection with All-Metal Telescoping Tunnel | Black, XXL, Single Flap

A heavyweight, energy-focused wall pet door that aims to solve drafts and durability for big dogs—great hardware and insulation if you can handle a fiddly install.

Doors, Gates & Ramps

Endura Flap Pet Door for Walls in White | Energy-Efficient Double Flap Design for Wall Installations | All-Weather Protection with All-Metal Telescoping Tunnel | White, XXL, Double Flap

A high-end, energy-efficient wall pet door built for large dogs; excellent insulation and materials but expect a heavy install and watch for magnet-clip issues.

Dogs

3-Flap Steel Large Dog Door for Exterior Doors with Sliding Lock Panel, Energy-Efficient Insulated Pet Door, Extreme Weather Doggy Door with Telescoping Tunnel, Never Rust（Pets Up to 100 Lb）

A heavy-duty, 3-flap aluminum pet door built for exterior doors and claimed to fit pets up to 100 lb. Good insulation and a sliding lock—just be ready for a careful install.