9 Best Cat Doors for Windows in Cold Weather (November 2026)
The best cat doors for windows in cold weather include the CEESC X-Large Cat Door for Pets up (best overall for draft control), the Yoochee Sliding Cat Door for Window for sliding windows, and the Petoasis Cat Door for Window & Small for extra weatherstripping.
On this page (9 sections)
- How we compared these window cat doors for cold weather
- Best cat door for window in cold weather: the nine picks
- Window cat doors compared: fit, seal and lock at a glance
- What window width should you measure before buying a cold-weather cat door?
- Which flap seal keeps the most heat in cold weather?
- Should you choose glass or acrylic for a winter window cat door?
- How do the lock modes help with winter weather and security?
- How much does a window cat door cost in the long run?
- Verdict: which cold-weather window cat door should you buy?
The best cat door for window in cold weather is the CEESC X-Large Cat Door for Pets up, because its exterior rain seal and brush strip close the flap gap that lets winter air in. The Yoochee Sliding Cat Door for Window is the better fit if your window slides up and down (vertical sliding sash).
Cold weather is the hard test for any window pet door. A warm-weather insert can leave a gap at the flap or at the window track, and that gap pulls heated air straight outside.
The nine models here all address that in some way, but the details matter more than the category label.
Our picks at a glance
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1
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2
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3
Best for extra weatherstrippingPetoasis Cat Door for Window & Small
8.3/10 our score
See it on Amazon
- 4
Check itYoochee 2-in-1 Cat Door for Window
Best for ventilation control - 5
Best for odd window sizesCheck it - 6
Check itZerzuo Quick-Fit Cat Door for Window
Best for medium cats - 7
Check itOLenyer Full-Size Cat Door for Window Weatherproof
Best for shy cats - 8
Best for rentersCheck it - 9
Check itYGNNJY Aluminum Cat Door for Windows
Best budget aluminum frame
How we compared these window cat doors for cold weather
We compared these inserts by what keeps warmth in: flap seal design, weatherstripping, frame material and window fit range. Scores weigh those specs against what a cold-climate buyer needs most.
Everything here comes from manufacturer specs: flap dimensions, window fit ranges, seal materials and lock modes.
Where two models look similar, the tiebreaker is the seal around the edges, because that's where most winter drafts start.
Our score weighs specs, features and fit against what you're shopping for. A wide window fit range earns credit only when the seal holds up.
A weather seal counts more than a glass panel in a cold-weather roundup.
One more check matters here: the window itself. A cat door insert sits in the track, so your window no longer closes fully against the frame.
That's true of every sliding insert in this list.
If the opening in your home isn't a window, our guide to the best dog doors for cold weather covers door-mounted options with the same draft concerns. For the wider category, see our cat door comparison.
Best cat door for window in cold weather: the nine picks
The CEESC X-Large is the strongest cold-weather choice for most homes, with the Yoochee Sliding model close behind for sliding windows.
The rest of the list solves narrower problems: extra sealing, ventilation control, odd window sizes or a lighter flap for an unsure cat.
CEESC X-Large Cat Door for Pets up: Best overall for draft control
- Exterior rain seal on the flap
- Brush strip reduces closing noise
- 4-way switch (Out, In, Both, Locked)
- Fits doors 1.26-2.17 in thick
- ABS frame
The CEESC X-Large suits a home where the window is the only practical spot for a pet door and winter drafts are the main worry. Its exterior rain seal covers the flap from the weather side, and the brush strip quiets the flap as it swings shut.
The flap is clear, so your cat can see the yard before pushing out. A 4-way switch covers Out Only, In Only, Both and Fully Locked, which matters on a cold night when you want the opening shut.
The inner opening is 7.9 x 8.7 in and handles cats and small dogs up to 25 lb.
It fits doors 1.26 to 2.17 in thick with an adjustable tunnel depth. That range makes it the most adaptable frame here for mounting, though the same depth adjustment is what you'd use in a window track.
The trade-off is size. At 9.8 in wide and 11 in high, it takes a real bite out of a small window, and the ABS frame is lighter than the aluminum models below.
Yoochee Sliding Cat Door for Window: Best for sliding windows
- Aluminum frame with HD glass
- Magnetic flap closure
- Built-in weather seal
- 4 locking mechanisms
- Tool-free install
Yoochee's sliding window door suits a vertical sliding sash, the most common window type in many homes. It slides into the track and locks in place without tools, so the install takes minutes and leaves no marks.
The aluminum frame and HD glass give it more rigidity than a plastic insert. A built-in weather seal blocks wind and rain, and the magnetic flap closes itself after each pass.
Four locking modes run from Two-Way to Fully Locked.
It fits windows 32 to 37 in wide, with a 7.1 x 7.2 in flap and a 15 in frame height. That flap is on the small side, so check your cat's width before ordering.
The 10 lb weight limit also rules out larger cats.
The glass panel is the draw in cold weather: it holds warmth better than a thin plastic sheet. Just note that this model carries a lower pet weight limit than most of the list.
Petoasis Cat Door for Window & Small: Best for extra weatherstripping
- Thickened aluminum frame
- Tempered glass panel
- Pre-installed weatherstripping plus extra foam and vinyl seals
- Extra window lock
- 4-way lock
Petoasis suits a buyer who wants the window opening to seal as tightly as possible. It ships with weatherstripping already fitted, plus extra foam and vinyl seals, so you can build up the edges where the insert meets the frame.
The frame is thickened aluminum, and the flap is behind tempered glass. A magnetic closure snaps the flap shut, and four lock modes control access.
An extra window lock is included, which adds a security layer.
It fits windows 28 to 32 in wide. The flap opening is 7.8 x 10.6 in, one of the taller openings here, so a medium cat passes easily.
The frame is 15.3 in high and 0.9 in thick.
The trade-off is weight. A thicker aluminum frame plus glass makes this heavier to lift into the track than a plastic insert, and the extra seals take time to fit properly.
Yoochee 2-in-1 Cat Door for Window: Best for ventilation control
- Acrylic panel plus metal mesh screen
- Rainproof and ventilation dual modes
- Magnetic closure
- 4 locking mechanisms
- Sealing strip
The Yoochee 2-in-1 suits a household that wants fresh air in mild spells and a sealed barrier in cold snaps. Open the acrylic panels for a bug-free cross-breeze, then close them for a tight barrier against rain, wind and dust.
The flap uses a magnetic closure and a sealing strip to shut after each use. Four locking modes run from Two-Way to Fully Locked.
The frame is aluminum with an acrylic panel and metal mesh screen.
It fits windows 28 to 32 in wide, with a 7.6 x 8.1 in flap and a 14.4 in frame height. The mesh screen is what makes the ventilation mode useful, since it keeps insects out while the panels are open.
The trade-off against the Yoochee sliding model is glass. Acrylic is lighter and easier to handle, but it insulates less well than the HD glass on the 8.6 model.
In a hard freeze, keep the panels closed.
Custom Cat Door Window Insert: Best for odd window sizes
- Custom-cut 1/4-inch PVC base
- Insulated with foam and brush weatherstripping
- Tool-free install
- Microchip lock option
- Made in the USA
The Custom Cat Door Window Insert suits a window that falls outside the fit range of every ready-made insert here. It's cut to your measurements in a 1/4-inch PVC base, with foam and brush weatherstripping on all four sides and around the flap.
That custom fit is the cold-weather advantage. A base cut to your window width seals at the edges without the gaps a telescoping frame can leave.
It installs and removes in under two minutes with no drilling.
You can choose a magnetic, 4-way or microchip lock, and the microchip version recognizes up to 30 pets. The base measures 30 x 12 in and fits window thicknesses up to 6 in.
It's rated for pets up to 15 lb.
The trade-offs are cost and lead time. Custom cutting means a made-to-order wait and a higher price than stock inserts, and the 10 lb Yoochee Sliding limit is the lowest here.
Zerzuo Quick-Fit Cat Door for Window: Best for medium cats
- Aluminum frame
- Magnetic auto closure
- Tight seal against drafts
- Scratch-resistant finish
- Hardware included
The Zerzuo Quick-Fit suits a medium cat in a wide window. Its fit range runs from 31 to 36 in and is tied for the widest fit range here, and the aluminum frame takes the knocks of daily use without flexing.
A magnetic closure keeps the flap shut automatically, and the tight seal design is aimed at stopping drafts and holding indoor temperature steady. The scratch-resistant finish helps the frame stay clean in a busy room.
Hardware is included, so you can fit or remove it without a trip to the hardware store. The frame sits in a track 0.9 in thick, which matches most standard sliding window tracks.
The trade-off is that the weather sealing is described in general terms rather than as a fitted kit. It has no extra foam or vinyl seals like the Petoasis, so buyers in exposed, windy spots may want to add their own strip along the edges.
OLenyer Full-Size Cat Door for Window Weatherproof: Best for shy cats
- Lighter magnet for easy flap push
- Weatherstripping, foam bumper seal and vinyl draft seal
- 4-mode lock
- Aluminum frame with glass
- 3-year after-sales service
The OLenyer Full-Size suits a shy, senior or slow-learning cat that needs an easy push. Its magnet is deliberately lighter than the strong closures on the other models, so the flap gives way with less effort while still closing behind the cat.
Weather protection comes as a kit: built-in weatherstripping plus a foam bumper seal and a vinyl draft seal. That's a complete set of seals for a cold window.
The frame is aluminum with a rigid plastic flap and glass for a clear view.
It fits windows 24 to 28 in wide, with a 7.7 x 8.6 in flap and a 12.9 in frame height. Four lock modes let you shut the opening at night or in a cold snap.
OLenyer backs it with a 3-year after-sales service.
The trade-off is the light magnet. In strong wind, a lighter flap can be pushed open more easily than a stiffer one, so it's a better fit for a sheltered window than an exposed one.
Slevoo Cat Door for Window: Best for renters
- No-cut, no-drill install
- Windproof strips plus foam buffer
- Magnetic closure
- Upgraded 4-mode knob lock
- 4mm tempered glass
The Slevoo suits renters who can't drill or cut. It pops into a sliding window track with no tools and comes back out in minutes, so you can take it with you when you move.
Foam buffer and windproof strips add sealing at the frame edges.
Its upgraded 4-mode knob lock is the easiest lock here to operate. Rotate the knob until it clicks to switch between In Only, Out Only, Both Ways and Locked.
The flap uses a magnetic closure to snap back after each pass.
The frame is thickened aluminum with 4mm tempered glass. That glass resists impact and holds warmth better than a plastic panel.
Windproof strips plus the magnetic flap work together to block cold air and save heating energy.
It fits windows 23 to 28 in wide, with a 7.5 x 8.3 in flap. That covers the smallest windows on this list (23-28 in), so measure carefully.
The trade-off is a smaller opening and a shorter track range than the wider models.
YGNNJY Aluminum Cat Door for Windows: Best budget aluminum frame
- Aluminum frame with hard-glass panel
- Magnetic locking closure
- Gray brush strips for insulation
- 4 lock modes
- Tool-free install
The YGNNJY Aluminum Cat Door suits a buyer on a budget who still wants an aluminum frame. It's the least expensive way to get a metal frame and a hard-glass panel in this group.
The magnetic locking closure pulls the flap shut after each pass, and gray brush strips add insulation along the flap edge. Four lock modes let you manage when your cat goes out.
The aluminum alloy frame has a white coating that resists scratches and corrosion.
It fits windows 28 to 32 in wide and installs without tools. YGNNJY says the design keeps out rain, wind and snow year-round.
The glass panel keeps the view clear while blocking drafts better than a plastic flap alone.
The trade-off is the seal kit. It relies on the magnetic flap and brush strips without extra foam or vinyl weatherstripping, so it's the least protected of the aluminum models against driving rain.
Window cat doors compared: fit, seal and lock at a glance
The table lines up the fit range, flap size and seal features so you can match a model to your window before reading the detail above. Wider fit ranges are not automatically better; a close fit seals tighter in cold weather.
| Product | Best for | Outer size | Flap opening | Pet weight limit | Our score |
|---|---|---|---|---|---|
| CEESC X-Large Cat Door for Pets up | overall for draft control | 9.8W x 11H x 2.15D in | 7.9W x 8.7H in | 25 lb | 9.7 |
| Yoochee Sliding Cat Door for Window | sliding windows | 8.6 | |||
| Petoasis Cat Door for Window & Small | extra weatherstripping | 8.3 | |||
| Yoochee 2-in-1 Cat Door for Window | ventilation control | 8.1 | |||
| Custom Cat Door Window Insert | odd window sizes | 15 lb | 8.0 | ||
| Zerzuo Quick-Fit Cat Door for Window | medium cats | 7.9 | |||
| OLenyer Full-Size Cat Door for Window Weatherproof | shy cats | 7.8 | |||
| Slevoo Cat Door for Window | renters | 7.7 | |||
| YGNNJY Aluminum Cat Door for Windows | budget aluminum frame | 7.6 |
What window width should you measure before buying a cold-weather cat door?
Measure the window's inner width and the track thickness first, because a window cat door only seals well when its frame sits close to the track edges. A frame at the edge of its fit range leaves a gap that cold air finds.
Here's the fit range for each model in this roundup:
- CEESC X-Large: fits doors 1.26 to 2.17 in thick; inner opening 7.9 x 8.7 in.
- Yoochee Sliding: windows 32 to 37 in wide.
- Petoasis: windows 28 to 32 in wide.
- Yoochee 2-in-1: windows 28 to 32 in wide.
- Custom Cat Door Window Insert: base 30 x 12 in, cut to your window.
- Zerzuo Quick-Fit: windows 31 to 36 in wide.
- OLenyer Full-Size: windows 24 to 28 in wide.
- Slevoo: windows 23 to 28 in wide.
- YGNNJY: windows 28 to 32 in wide.
Measure the opening your window leaves when it's slid open, not the full glass width. That opening is what the insert has to fill.
Also measure the track depth; most inserts here fit a track around 0.9 to 1 in thick.
Should you pick the widest fit range or the closest one?
Pick the model whose range puts your window near the middle, not at the edge. A telescoping frame that's stretched to its limit has less overlap at the seals, and that's where winter air gets in.
What if your window is outside every fit range?
Choose the Custom Cat Door Window Insert. It's cut to your measurements, so the base seals at the edges without a gap.
Expect a made-to-order wait and a higher price than a stock insert.
Which flap seal keeps the most heat in cold weather?
A magnetic flap with a sealing strip plus a brush or foam edge keeps the most heat in, because it closes flat after every pass. A plain gravity flap can hang slightly open and leak warm air all day.
Three seal types show up in this group, and each behaves differently in winter:
- Magnetic closure: the flap snaps shut on its own. The Yoochee models, Petoasis, Zerzuo, OLenyer, Slevoo and YGNNJY all use one. Best for a busy cat that comes and goes often.
- Brush strip: a line of bristles along the flap edge blocks the thin gap the flap leaves. The CEESC and YGNNJY include one. Good for cutting the constant small leak.
- Foam or vinyl weatherstripping: fitted around the frame edges, not the flap. The Petoasis, OLenyer, Slevoo and Custom insert ship with it. Best for the gap between insert and window frame.
Is a brush strip or foam weatherstripping more important?
Both matter, but they seal different gaps. Foam weatherstripping seals the frame-to-window edge, and a brush or magnetic flap seals the flap opening.
A model with only one leaves the other gap open.
Does a lighter magnet help in cold weather?
It helps the cat, not the seal. A lighter magnet, like the OLenyer's, is easier for a shy or senior cat to push.
The trade-off is that a strong gust can push the flap open more easily, so pair it with a sheltered window.
Should you choose glass or acrylic for a winter window cat door?
Glass holds warmth better than acrylic, so a glass-paneled insert is the better cold-weather choice when the panel faces the weather. Acrylic is lighter and easier to handle, but it insulates less.
Here's how the two compare across this list:
- HD glass: the Yoochee Sliding model and the Zerzuo frame use glass, and the Petoasis uses tempered glass. These keep the view clear and block drafts better.
- Acrylic: the Yoochee 2-in-1 uses an acrylic panel. It's the better pick when you want to open the panel for ventilation, since acrylic is lighter to handle.
- Hard glass: the YGNNJY uses a hard-glass panel, which resists scratches and holds warmth better than a plastic flap.
Does the flap material matter as much as the panel?
Yes, for daily use. A rigid plastic flap, like the OLenyer's, stays flat and keeps its shape.
A softer flap can curl at the edge over time, and a curled edge is where drafts start.
Which is better in a very cold climate?
Glass, paired with foam weatherstripping. Glass resists fogging and holds its shape in low temperatures, and the foam strip seals the frame edge.
Acrylic can crack in extreme cold if it takes a hard knock.
How do the lock modes help with winter weather and security?
Set the flap to In Only or Fully Locked when the weather turns, because that closes the opening to outside air and keeps strays out. Every model here offers at least four lock modes.
The lock modes on these inserts follow the same pattern: Two-Way (free passage), In Only, Out Only and Fully Locked. Use In Only on a cold, wet night so your cat can come in but nothing can enter.
Use Fully Locked when you're away.
Two models add a security extra. The Petoasis includes an extra window lock, which keeps the window itself from being slid open from outside.
The Custom insert offers a microchip lock that opens only for your cat's chip, which stops other animals from pushing in.
If you're weighing whether a pet opening is safe at all, our guide to whether dog doors are safe for your home covers the security questions that apply to cat doors too. The same checks apply: lock it at night, keep the opening away from reach, and make sure the window still locks.
Is a microchip lock worth it in cold weather?
It's worth it if strays or wildlife push through your opening. A microchip lock only opens for a registered pet, so nothing else gets in.
That keeps the flap shut when your cat is inside and the weather is bad.
Should you lock the flap at night?
Yes. Lock it to In Only or Fully Locked overnight.
An open flap on a cold night pulls heat out of the room all night, and a locked flap keeps the seal tight until morning.
How much does a window cat door cost in the long run?
The insert itself is only part of the cost, because a poorly sealed window door can add heating cost all winter. A model with a full seal kit pays that back faster than a cheaper one with a loose flap.
Three things drive the long-run cost:
- Seal quality. A flap that closes flat and a frame with foam weatherstripping keep heated air in. A model without those leaks warm air and makes your heating work harder.
- Window fit. An insert near the edge of its fit range leaves a gap. That gap is a steady leak you can't fix without changing the insert.
- Window type. A sliding window insert leaves the window itself partly open. In very cold weather, that's a bigger heat loss than the flap. A door-mounted pet door avoids that, which is why our PetSafe Extreme Weather dog door review covers a door option for cold climates.
Does a more expensive insert save money on heating?
It can, if the extra money buys a better seal. A model with foam and vinyl weatherstripping plus a magnetic flap keeps more heat in than a bare plastic insert.
The saving depends on your climate and how often the cat goes out.
Is it cheaper to fit a door-mounted pet door instead?
Often, yes, in heating terms. A door-mounted door doesn't hold a window open.
But it means cutting a hole in a door, which renters can't do. For renters, a well-sealed window insert is the practical choice.
Verdict: which cold-weather window cat door should you buy?
For most homes, buy the CEESC X-Large Cat Door for Pets up. Its exterior rain seal, brush strip and 4-way lock make it the best cat door for window in cold weather, and its adjustable tunnel depth fits the widest range of frames here.
Pick the Yoochee Sliding Cat Door for Window if your window slides sideways and you want glass and a magnetic flap. Pick the Petoasis Cat Door for Window & Small if draft control is the top priority and you want extra seals and a window lock.
Renters should look at the Slevoo, and anyone with an unusual window size should order the Custom Cat Door Window Insert. Measure your window width and track depth before you order, then choose the model whose fit range puts your window near the middle.
Our top 3 picks at a glance
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1
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2
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3
Best for extra weatherstripping
Petoasis Cat Door for Window & Small
8.3/10 our score
See it on Amazon
Frequently asked questions
Will a window cat door let cold air into my house?
A window cat door with a weather seal and a flap that closes fully limits cold air to the moments your cat passes through. Most models here include a magnetic flap or sealing strip.
The weak point is the window track seal, so add foam weatherstripping there if you feel a draft.
Can I install a cat door in a sliding glass window without damaging it?
Yes. Sliding window inserts sit in the window track and lock into place, so no drilling or cutting is needed.
They remove in minutes for cleaning or moving out.
Renters can usually fit one without landlord approval, though it's worth asking first.
What window width do I need for a cat door insert?
Measure your window width and track thickness before ordering. Inserts in this roundup fit windows from 23 to 37 inches wide, and each model lists its own range.
A frame outside your window's range will not seal, so cold air and rain get past the edges.
How do I stop drafts around a window cat door?
Add foam weatherstripping along the top and bottom edges of the window frame where the insert meets it. Check that the flap closes flat against the frame and that the magnetic strip grabs.
A second strip along the side tracks helps in very cold weather.
Is a window cat door safe to leave unprotected overnight?
Set the flap to In Only or Fully Locked at night so nothing can enter from outside. A window insert with a lock mode gives you that control.
Also check that the window itself still locks when the insert is in place.
Can small dogs use a window cat door in cold weather?
Some models here fit small dogs as well as cats. The CEESC handles pets up to 25 lb, and the Petoasis lists small dogs in its fit range.
Check your dog's chest width and weight against the flap opening before buying.
