Best insulated outdoor cat shelters

Top pick: Aivituvin Insulated Cat House AIR12-IN — a solid wood, insulated house with a raised floor and a heating pad, which is the combination that actually keeps a cat warm: dry, off the ground, and out of the wind. It's the best balance of real insulation and a size that fits a porch or a sheltered corner.

Who the others suit:

• Aivituvin Heated Feral Cat Shelter AIR7033-IN-HP — the serious cold-weather choice: six-sided insulated liner, heating, and room for more than one cat.
• Outdoor Cat House with Thermal Foil Lining (shopGDLF) — widest footprint, good for a colony spot where several cats need to get in out of the rain.
• Aivituvin 2-Story Heated Cat House AIR94-IN-HP — two levels and a waterproof asphalt roof, for cats that like to climb and tuck in.
• 2-Story Insulated Wooden Cat House (Petscosset) — the budget route to a two-level insulated wooden house.
• Aivituvin Outdoor Cat House with Insulated Liner — the simplest insulated wooden option if you want to add your own straw bedding.

Whatever you choose, put it up on bricks, face the door away from prevailing wind, and use straw rather than blankets — blankets hold moisture and freeze.