She won't move off the window sill, so bring the heat to her. The Thermo-Kitty Mat is a flat 12.5 x 25 inch pad on 6 watts. Lay it on the sill, the cat tree shelf or inside the bed she already owns.
Best no-plug pick: K&H Self-Warming Pet Pad
K&H Self-Warming Pet Pad
Best for: A spot with no outlet nearby, or a cord chewer in the house.
No outlet by the cat tree? A kitten who chews cords? The Self-Warming Pet Pad has no cord at all. It catches her body heat and sends it back to her. It adds no heat of its own, and the whole pad goes in the washer.
Best heated dog bed, and for outdoor cats: K&H Lectro-Soft
K&H Lectro-Soft Outdoor Heated Bed
Best for: A dog with stiff joints on a cold floor, or the barn, porch or garage cat.
Stiff old dog on a cold floor? Barn cat on the porch? The Lectro-Soft Outdoor Heated Bed is rated for indoor and outdoor use, and every size has a 5.5-foot steel-wrapped cord. Three sizes: Small 14 x 18 inches (20 W), Medium 19 x 24 (40 W), Large 25 x 36 (60 W).
Is a heated cat bed safe? Five rules
A heated pet bed is a low-watt, thermostat-controlled pad, built to stay warm, not hot. The three plug-in K&H beds here are MET listed. Use them like this:
Plug it straight into the wall, never an extension cord.
Leave her a cool spot to move to. Never put a heated pad in a closed carrier or a crate she can't leave.
Don't cover the pad with a blanket.
Ask your vet first for a young kitten, a pet after surgery, or one that can't get up and move away.
Got a chewer? Use the steel-wrapped cord of the Lectro-Soft, or the no-plug pad.
The short version
Most indoor cats: Thermo-Kitty Bed, 4 watts, warms to about her body temperature.
Yes, a low-watt, thermostat-controlled bed is built for it. Give her room to move off it, plug it into the wall, and ask your vet first for a young kitten or a cat recovering from surgery.
Can you leave a heated cat bed on all the time?
Yes. The Thermo-Kitty Bed is built to run 24/7. It has no on/off switch, so unplug it when you leave for a few days.
Do self-warming cat beds really work?
They work by reflecting your cat's own body heat back to her, with no power. They add no heat of their own, so they warm less than a plug-in bed. For an old or thin cat, pick a heated bed.
How hot does a heated cat bed get?
The Thermo-Kitty Bed sits about 15°F above room temperature when empty and warms to about 102°F when she lies on it.
Are heated dog beds safe?
Yes, if it's made for dogs. Get a steel-wrapped cord for a chewer, like the Lectro-Soft, don't cover it with a blanket, and skip it for a dog that shreds beds.