Do You Need a Window Air Conditioner Cover for Winter?

On this page (7 sections)

1. Do you need a window air conditioner cover for winter?
2. Should you cover the unit inside, outside, or both?
3. How do you measure a window air conditioner for a winter cover?
4. How should you prepare and fit a winter AC cover?
5. What care keeps a cover useful through winter?
6. What mistakes should you avoid with winter AC covers?
7. Which window air conditioner cover for winter should you choose?

A window air conditioner cover for winter is useful when an unused unit needs protection from outdoor weather or cold drafts through its front. Choose the side you need to cover, measure it, and check the AC manual before buying.

Start by finding where the cold air enters. A cover over the cabinet won't repair gaps around the window, and an indoor cover won't protect the outside portion from snow.

Do you need a window air conditioner cover for winter?

You need a cover when the unit will stay installed, its manual allows covering, and you have a specific problem to address. That might be an exposed outdoor cabinet, drafts through the indoor face, or both.

Check the manufacturer's winter care directions first. If they call for seasonal removal, arrange safe removal and storage rather than using a cover as a substitute.

With the AC off, check around the front, side panels, and window frame for drafts. Air entering around the installation needs attention at those gaps, while air coming through the unit is the problem an indoor cover targets.

A cover also won't fix movement in the cabinet. Review how to install a window air conditioner if the unit shifts or its mounting looks loose.

Should you cover the unit inside, outside, or both?

Choose outside for weather exposure, inside for drafts through the unit, or both for both problems. There is little reason to buy a two-piece set when you only need one side covered.

An outdoor cover wraps the cabinet that projects beyond the window. Its fit depends on cabinet depth, support hardware, and whether you can reach the straps safely.

An indoor cover fits over the room-facing front. Controls, trim, and the power cord can affect how closely it sits, so front dimensions matter more than the AC's cooling capacity.

A two-piece set suits a unit exposed to winter weather that also lets cold air into the room. Measure each side separately rather than assuming the pieces have matching dimensions.

Which outdoor window air conditioner cover suits winter exposure?

The i frmmy outside cover suits buyers who need an insulated exterior cover and can safely reach the cabinet to secure it. Skip it if your main problem is drafts at the indoor face or gaps around the window.

Its layers are waterproof Oxford fabric, aluminum foil, and pearl cotton. The buckles let you adjust the straps around the covered cabinet, but they don't secure the air conditioner itself.

i frmmy allows the bottom to be cut for a support bracket. Check the cover's position before cutting, then make only the opening needed for your hardware.

Choose another fit if the cabinet stretches the fabric tight or leaves the cover unable to close. Cutting for a bracket doesn't solve a cover that's too small overall.

Can the TOHONFOO indoor cover help with room-side drafts?

The TOHONFOO indoor cover suits a smaller room-facing unit when you want a draft barrier you can fit from indoors. Skip it if you need exterior weather protection or don't want adhesive-backed fasteners attached to the AC.

Its inner dimensions are 21 W x 15 H x 3.5 D in, but TOHONFOO specifies a maximum unit size of 20.5 W x 14.5 H x 3.5 D in. Use that smaller fit limit when deciding.

Pre-sewn and adhesive-backed straps hold the cover in place. The adhesive backing can stay attached when you unfasten the cover for seasonal removal.

Two closable cord openings let you route the cord from either side. Close the unused opening and avoid pinching the cord under an edge.

This cover needs gentle care: wipe it with a damp cloth and air-dry. Don't hand wash, machine wash, scrub, or twist it.

Who should choose the ANPHSIN inside-and-outside set?

The ANPHSIN two-piece set suits buyers who need both exterior protection and an indoor barrier on a larger window unit. Skip it if either piece is too large to close closely around your AC.

The indoor cover measures 27.5 W x 20 H x 3.5 D in, and the outdoor cover measures 27.5 W x 18.5 H x 22.5 D in. Check both sets of measurements before choosing it.

The outdoor piece uses Oxford cloth composite with aluminum film, while the indoor piece uses waterproof cloth and cotton. Adjustable drawstrings help gather the covers around the unit.

The included straps are 6.5 ft long, so check their route around your installation. ANPHSIN describes the set for units above 12,000 BTU, but cabinet measurements should decide the fit.

How do you measure a window air conditioner for a winter cover?

Measure width, height, and depth on the side you plan to cover, then compare every dimension with the cover's fit limits. A matching width alone isn't enough.

For an indoor cover, include knobs, trim, and anything else projecting from the front. Check that nearby curtains, walls, or the windowsill won't prevent the cover from sitting in place.

For an outdoor cover, measure the exposed cabinet from the window outward. Note where the support bracket touches it and whether straps can pass around it without pulling on window seals.

Don't automatically choose an oversized cover for easier installation. Excess fabric can bunch near the closure or leave loose areas that are harder to secure.

Our window air conditioner sizing and installation guide explains placement basics. For a less common layout, check whether a window AC works in a sliding window before planning around a standard cover shape.

How should you prepare and fit a winter AC cover?

Shut down, clean, and dry the unit before fitting the cover, following the AC manual's seasonal care steps. Unplug it if the instructions call for that step, keeping the cord accessible.

Use our guide to cleaning a window air conditioner if dirt has built up. Let cleaned surfaces dry before enclosing them, and leave any drainage path clear as directed.

Position the cover before tightening its drawstring or straps. Close it evenly, keeping fasteners away from sharp edges and avoiding pressure on controls, seals, or the mounting hardware.

Only fit an exterior cover from a safe position. If you can't reach the cabinet and fasteners safely, arrange help rather than leaning out of the window.

After fitting, check that the cover doesn't pull on the AC or interfere with the window. Make a visible reminder to remove all covers before operating the unit, especially if someone else may switch it on.

What care keeps a cover useful through winter?

Check the cover after strong wind and wet weather, then clean and store it according to its care directions. Look for loose straps, shifted edges, tears, or moisture beneath the fabric.

If you find dampness, remove the cover and let the surfaces dry before refitting it. Check for a drainage or fit problem instead of tightening the cover over trapped moisture.

Follow each cover's own cleaning method. TOHONFOO requires wiping only; don't assume a washing method suitable for another fabric is safe for its layered construction.

Before seasonal storage, clean the cover, let it dry fully, and check its closures. Store the pieces and straps together so nothing is missing next winter.

What mistakes should you avoid with winter AC covers?

Don't use a cover to hide an installation problem or cover a running unit. A seasonal barrier can't repair a damaged seal, hold up the cabinet, or replace the unit's winter care instructions.

Common buying and setup mistakes include:

• Choosing by BTU alone. Cooling capacity doesn't give you the cabinet's width, height, or depth.
• Confusing cover size with unit fit. Follow a stated maximum unit size when one is given.
• Ignoring the support bracket. Check clearances before buying or altering fabric.
• Expecting a heating-cost guarantee. Results depend on the draft source, fit, window seals, and room.
• Leaving covers on during operation. Remove every piece before using cooling, fan, or heat modes.

If stability is a concern, check whether you need a window air conditioner support bracket. If keeping the unit installed is impractical, compare window, portable, and through-the-wall air conditioners before choosing a different setup.

Which window air conditioner cover for winter should you choose?

Choose your window air conditioner cover for winter by the problem and the measured fit. Weather exposure, indoor drafts, and a loose window seal need different responses.

Pick i frmmy for exterior coverage with adjustable buckle straps. Pick TOHONFOO for a room-side draft barrier when its maximum unit dimensions and adhesive fasteners suit your AC.

Choose ANPHSIN when you need both sides covered and both pieces fit closely. If the draft comes from the window perimeter, address that gap first.

When seasonal removal is the better choice, plan for safe lifting and storage. If you're replacing the unit, our best window air conditioners guide can help you choose one that fits your room and window.

Frequently asked questions

Should you cover a window air conditioner in winter?

Cover an unused window air conditioner when its manual allows it and you need weather protection or help blocking drafts; choose an outdoor cover for the exposed cabinet and an indoor cover for air coming through the front. Clean and dry the unit first, and remove every cover before operation.

Is it better to cover a window air conditioner inside or outside?

Choose an outside cover for weather exposure and an inside cover for drafts through the unit; use both when you have both problems and the AC manual allows covering. Neither type repairs gaps around the window, so check the side panels and perimeter seals before buying a cover.

Can you leave a window air conditioner installed over winter?

Leave a window air conditioner installed over winter only if its manual permits it and the installation remains secure; follow its directions for drainage, seals, and seasonal care. If removal is recommended and you can arrange it safely, store the unit as directed rather than relying on a cover.

How do you measure for a window air conditioner cover?

Measure the width, height, and depth of the part you plan to cover, including controls and other protruding parts; compare each measurement with the cover's stated fit limits. For outdoor covers, also check bracket clearance and strap access; for indoor covers, check cord routing and space around the front.