9 Best AC Side Panel | Kill The Draft, Keep The Cool Air

Check Price on Amazon

A two-layer panel kit at entry-level money — good insulation if your window cooperates.

This kit runs two thick layers instead of one, which is the whole sales pitch here, and it does a good job of blocking heat and cold when it is installed cleanly. Each pair is sized at 17″ high by 10″ wide, and the maker rates it for window units between 5,000 and 20,000 BTU. The double layer gives it a firmer feel than a single foam sheet, and it also shades out light so the AC cabinet doesn’t sit in a sunbeam all afternoon. There is an installation choice too: it works as a clip-on or laid flat, so you can match the way your window is set up.

Quality is what people praise — the panels feel substantial, and installation with the included tape and instruction sheet can be done in an afternoon. But there’s a real fit caveat if your window is wider: the 10-inch width is a bit tight, and several owners found they had to trim carefully to avoid gaps. The panels are also brittle enough that some cracked during fitting, so take the cutting slow and support the edge as you go.

Check Price on Amazon

The one big foam sheet that wraps both sides of the AC cabinet in a single piece.

Here the panel measures 39″ wide by 17″ high — one sheet intended to fold around the air conditioner and cover both side gaps at once. That single-piece approach means there is no seam running down the middle of your window, and it is rated for window units between 5,000 and 15,000 BTU. Unlike the GCGOODS kit above, there is no separate top strip here, so it prioritises the side coverage and leaves the top gap to the unit’s own seal.

The foam has a leather-pattern finish on the outer face, which is why it looks more like window dressing than a raw construction material. It wipes clean and doesn’t pull at lint or pet hair. Trimming is done with regular scissors, so there is no special tool needed.

Because it is cut rather than framed, this panel wants a window that stays put. If you are the type who opens the sash to let a breeze in, you will be re-taping the sheet when you close it again. It is also more exposed to a single ragged cut line — if the trim wanders, that edge is what lets air through. For a dedicated summer-only unit that stays installed, that is a non-issue.

Check Price on Amazon

Summer and winter sealing — the one kit that also keeps insects and dust out of the gap.

Designed for units between 5,000 and 12,000 BTU, this surround panel measures 39″ wide by 17″ high and is cut to fit a window opening up to 39″ wide or smaller. The insulation job is its day one purpose: cold air stays in during winter, hot air stays out during summer, and the foam helps stop airflow and moisture along the side channels. It is a foam material like the others, but the maker makes a point of the insect barrier — the panel also blocks dust and small bugs that would otherwise march in through the open side gap.

Where this one works well is the fit-and-forget crowd. Owners tend to say it performs, keeps cool air from bleeding out, and is easy enough to install with scissors and the supplied double-sided tape. It also gives the unit a tidier appearance, which matters if your window faces the street or sits above the kitchen sink. The tidy look is a bonus on top of the sealing.

The honest split in feedback is on thickness and quality. Some panels feel thinner than expected, and durability and adhesion sit in mixed territory — the tape holding, then letting go after a hot summer. Expect to top up the tape now and then. It does the job, but it is not a premium permanent fixture.

Check Price on Amazon

Slimmer foam, wider unit range, and a top panel thrown in for the full surround.

This Pearwow kit includes both side pieces and a top panel, so you are sealing the three exposed faces of the unit in one go. The side panels measure 17″ long by 9″ wide and are rated to fit window units from 5,000 all the way to 22,000 BTU, which is the widest range on this list alongside the GCGOODS set. The foam has a smooth PU leather surface that is anti-vibration and helps kill noise, so the unit rattle is softened as well as the draft. A big plus for homes near a road: pollen, dust, heat and light all get sealed out behind the same panel.

At 0.75 inches, the foam is about half the depth of the GCGOODS panel, and that is exactly where the mixed feedback lands. It is thinner and less substantial in the hand than the 1.5-inch rival, and the tape holds loosely enough that some buyers end up adding their own. The good news is the install side — several owners say the whole measure-and-cut job takes about five minutes. The smooth leather face also wipes clean easily, so it keeps looking tidy after a hot summer of pollen blowing against the glass.

It seals both sides and the top, so it is a fair second option if you want a full-surround kit. Just size it as a lighter, thinner shield rather than a deep winter-rated barrier.

Check Price on Amazon

For units whose original accordion curtain is cracked, yellowed, or torn straight through.

This is a direct replacement, not a foam add-on. You get two vinyl accordion curtains with their frames, sized for most 10,000 BTU window air conditioners. It slides into the window channel and expands to fill the side gap, which is the same form factor your unit shipped with. Because it replaces rather than tapes over, you don’t end up with a foam sheet fighting an originential plastic panel that is already warped. The vinyl is described as better at insulation and dust-proofing, and it also blocks light so the gap doesn’t glow at night.

Fit is the whole story here. The accordion expands to cover the gap, so it works well when your window opening actually matches the range it was cut for. Owners who have a standard 10,000 BTU unit and a standard double-hung window tend to have a smooth install. But if your unit is a different brand or your window opening sits outside the intended span, the panel will show a gap at one edge. The listed fit feedback is genuinely split, and the incompatibility notes point at specific brand mismatches rather than a design flaw.

It is easy to install and the quality of the vinyl is decent for the price. Just verify your unit’s BTU and the window opening height before you order — this is the one pick on the list where measuring carefully is more important than any other step.

Check Price on Amazon

For wide windows, this is the framed kit that stretches further than the rest.

The headline is adjustability. These panels extend up to 15″ wide on each side, which is wider than a typical side panel, so a wide window opening doesn’t leave you short. Height also adjusts to fit an opening up to 17″, and the set is rated for most window units between 5,000 and 14,000 BTU. Made of soft flexible vinyl, it insulates, and it also resists wind and dust in the side gap. The soft vinyl side also means you can cut it down to your desired height with more forgiveness than a brittle accordion.

The package includes left and right panels with frames, a foam seal strip for any gap you can’t close with the panels alone, and detailed instructions. That foam strip matters — on a wide window there is almost always a sliver of daylight left at the edge, and the strip is the backup for it. Owners who measured their unit first say it fits well and installs easily.

Functionality is the strong suit, but the build and assembly notes are where the honest weight sits — some kits feel fiddly to put together, and others find the panels too narrow for wider openings than expected. Take the height measurement seriously and check your unit’s actual width before ordering.

Check Price on Amazon

A dedicated-fits replacement for 8,000 BTU units — but check the brand first.

This one is precise about who it serves: it is built for 8,000 BTU window air conditioners. The panel measures 12-1/4 inches high by 10-7/8 inches wide, and it comes as a pack of two framed accordion sides. That framing gives a firmer seal than a taped-on foam sheet, and it also helps with noise — the accordion structure cuts down on outside noise and light leaking through the side channel. Insulation and dust-proofing are the other two jobs it handles, along with reducing drafts.

Two things are non-negotiable here. First, it is not compatible with LG brand window air conditioners — the maker says that flatly, so do not order it for an LG. Second, the foam strip that seals any residual gap between the AC and the window is sold separately, so if your model leaves even a thin gap expect to add a roll. Owners who have the right Frigidaire 6,500 BTU unit report it works; others with different models find it doesn’t line up. That is a compatibility issue, not a defect — the panel is built for one specific footprint.

Check Price on Amazon

A framed pair cut for one job — 10,000 BTU units and nothing else.

The frame on this pair measures 10-1/8 inches wide by 14 inches high, and it is built to fit most 10,000 BTU window air conditioner units. That is the single most important measurement on this pick: it is not a universal cut-to-fit kit, it is a precise replacement for a specific class of cabinet. The accordion curtains are heat-insulated and wind- and dust-proof, so the same panel that stops the summer draft out handles the winter cold coming in. It also cuts outside noise and light through the side gap.

One pair of framed panels, left and right, is what arrives — no tape, no foam strip. The maker warns that different AC brands and models leave a gap between the unit and the window frame, and suggests a foam strip, which is not included. That means if your unit isn’t a snug fit, budget for that extra roll. This is the newest kit on the list with the smallest review base, so treat fit feedback as thinner evidence than the established picks.

Installed carefully on a matching unit, it gives the tidy, straight-edged look a foam sheet is hard-pressed to match — the frame hides the accordion fold. But verify your unit’s exact BTU and the frame size before ordering, because this panel has very little give.