Will this fit my window air conditioner?

It seals gaps up to about 1-1/4 inches and the strip is 42 inches long, so it suits most single window units. Measure your gap and window width first; large units may need two strips.

Clean and dry the frame, cut the foam to length with scissors, and press the adhesive side into the gap. Closing the window compresses the foam to seal it.

Does it really reduce noise?

It dampens vibration and rattles by cushioning the unit against the frame. It will not block compressor noise, but owners report a quieter window unit.

Can I use it on a door or other gaps?

Yes. The foam is general-purpose weatherseal, so it works on door and window gaps within the 1-1/4 inch limit, though it is shaped for A/C openings.

Will the adhesive hold through summer heat?

The foam stays flexible in heat, but the adhesive is the weak point for some owners. Clean the surface first and press firmly; a few add tape or staples if it lifts.

What do buyers say about the M-D Building Products Air Conditioner Weather Seal Kit?

Rated 3.6 out of 5 from 54 ratings.

Where can I buy the M-D Building Products Air Conditioner Weather Seal Kit?

2 stores we checked sell it, including The Home Depot, Amazon.

M-D Building Products Air Conditioner Weather Seal Kit

Best price now

$5.21at The Home DepotChecked 12 h ago

Prices are checked against each store and labelled with when.

Visit The Home Depot

M-D Building Products Air Conditioner Weather Seal Kit

Best price now

$5.21at The Home DepotChecked 12 h ago

Prices are checked against each store and labelled with when.

Visit The Home Depot

Ask our agent about this product

It checks today's price at every store, compares the alternatives and answers in about a minute.

Price facts

Lowest price today: $5.21 at The Home Depot (checked Nov 10, 2026).

Our take on the M-D Building Products Air Conditioner Weather Seal Kit

This is a foam strip made to seal the gap around a window air conditioner, sold as model 02535. The high-density foam compresses to fill gaps up to about 1-1/4 inches and stays flexible in hot and cold weather. It cuts with scissors, so fitting it around a window unit takes minutes. It is a simple, low-cost fix for drafts, rattles and bugs around an A/C, not a full insulation solution. Reviewers rate it around 3.6 out of 5, with complaints mostly about adhesion and the foam tearing or compressing flat.

Best forSealing drafts and bugs around a window A/CQuieting rattles and vibration from a window unitRenters who want a no-tools, removable sealFilling uneven gaps up to about 1-1/4 inches

Pros

Cuts to length with scissors, no tools needed
Stays flexible in hot and cold temperatures
High-density foam fills gaps up to about 1-1/4 inches
Dampens vibration and noise from window units
Blocks drafts and insects around the A/C

Cons

Adhesive backing can fail in heat or on dusty frames
Foam can tear or flatten under window pressure
One strip may not cover a large window unit
Gray color may not match every window frame

M-D Building Products Air Conditioner Weather Seal Kit prices at every store

The Home DepotNew
Availability unknown
$5.21Free shippingChecked 12 h ago
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Also available at

AmazonCheck price at Amazon

M-D Building Products Air Conditioner Weather Seal Kit price history

Lowest price we've seen: $3.98 on Nov 10 at Amazon. Tracked across 2 stores since Nov 10.

What reviewers say

3.6 / 554 ratings

Buyers who got a good fit say it cuts easily and quiets rattles and drafts around window units. Others report the adhesive letting go or the foam crushing flat, which drags the average rating down.

What people mention

AdhesionCriticisedSeveral owners say the adhesive backing lets go, especially in heat or on dusty frames.
InstallationPraisedBuyers find it easy to cut with scissors and fit around a window unit.
NoisePraisedUsers report less rattle and vibration from the A/C after sealing the gap.
DurabilityCriticisedSome say the foam tears or flattens once the window is closed on it.
DraftsPraisedOwners say it blocks drafts and insects around the unit.

From The Home Depot

High-density foam weatherseal for window air conditioner units
Helps to reduce noise and vibration
Provides insect barrier
Beige foam weatherstripping
1.375 in. x 3.5 ft.

Returns: Free & easy returns in store or online; return within 90 days of purchase.

About the M-D Building Products Air Conditioner Weather Seal Kit

The M-D Air Conditioning Weatherseal remains flexible in hot or cold temperatures. This weatherseal reduces drafts, vibrations and noise. Provides a barrier against insects around the A/C unit. Before installation, cut to desired length with scissors.

Specifications

Length: 42"LSource
Width: 2.25"WSource
Thickness: 0.75 InchesSource
Material: FoamSource
Color

Questions and answers

Will this fit my window air conditioner?: It seals gaps up to about 1-1/4 inches and the strip is 42 inches long, so it suits most single window units. Measure your gap and window width first; large units may need two strips.
How do I install it?: Clean and dry the frame, cut the foam to length with scissors, and press the adhesive side into the gap. Closing the window compresses the foam to seal it.
Does it really reduce noise?: It dampens vibration and rattles by cushioning the unit against the frame. It will not block compressor noise, but owners report a quieter window unit.
Can I use it on a door or other gaps?: Yes. The foam is general-purpose weatherseal, so it works on door and window gaps within the 1-1/4 inch limit, though it is shaped for A/C openings.
Will the adhesive hold through summer heat?: The foam stays flexible in heat, but the adhesive is the weak point for some owners. Clean the surface first and press firmly; a few add tape or staples if it lifts.
Where is the M-D Building Products Air Conditioner Weather Seal Kit cheapest?: At The Home Depot, for $5.21, as of our latest check.
What do buyers say about the M-D Building Products Air Conditioner Weather Seal Kit?: Rated 3.6 out of 5 from 54 ratings.
Where can I buy the M-D Building Products Air Conditioner Weather Seal Kit?: 2 stores we checked sell it, including The Home Depot, Amazon.