Which size fits my window A/C?

Match the cover to the unit's BTU rating: AC2H for up to 10,000 BTU, AC3H for 10,000 to 15,000 BTU, and AC5H for 15,000 BTU and up. Check the unit's width, height and depth against the listed dimensions before choosing.

Does it insulate the unit?

Only lightly. The 6 mil polyethylene blocks wind, rain and snow and reduces drafts, but it has no padding, so do not expect it to keep the room warm on its own.

Can I leave it on all winter?

Yes, that is its purpose. The maker says the fabric will not crack or mildew, but check for trapped moisture after wet spells and dry the unit before the season starts.

Will it fit a unit that is not exactly the listed size?

The elasticized strap pulls the cover tight, so a slightly smaller unit can work. A unit larger than the listed dimensions will not be covered properly.

Do I need to remove the A/C unit first?

No. The cover goes over the unit while it stays in the window, which is the point for people who leave the unit installed year-round.

Is it better than a canvas cover?

It is lighter and simpler to fit, but canvas and insulated covers add padding and warmth that this plastic shell does not. Choose this one for basic weather and draft blocking.

Where is the Frost King Air Conditioner Cover cheapest?

At The Home Depot, for $5.68, as of our latest check.

Where can I buy the Frost King Air Conditioner Cover?

5 stores we checked sell it, including filingsupplies.com, eBay, Poshmark, Walmart, The Home Depot.

Frost King Air Conditioner Cover

Best price now

$5.68at The Home DepotChecked Nov 10

Compared across 5 stores. Prices are checked against each store and labelled with when.

Visit The Home Depot

Frost King Air Conditioner Cover

Best price now

$5.68at The Home DepotChecked Nov 10

Compared across 5 stores. 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

Last seen at $5.68 at The Home Depot on Nov 10.
Checked at 5 stores.

Our take on the Frost King Air Conditioner Cover

The Frost King Window Air Conditioner Cover is a simple outdoor shell that seals a window A/C unit for the off-season. It is made of 6 mil polyethylene that the maker says will not crack or mildew, and an elasticized strap pulls it tight against the unit. Three sizes cover units up to 10,000 BTU, 10,000 to 15,000 BTU, and 15,000 BTU and up. It suits anyone who leaves a window unit installed through winter and wants to cut drafts and heat loss. Rivals in this niche are mostly canvas or insulated covers; this one is thinner and cheaper in build, so it blocks weather and drafts but adds little insulation.

Best forSealing a window A/C unit left in place over winterCutting cold drafts and heat loss around a window unitRenters who want a no-tools seasonal coverOwners of units up to 15,000 BTU who want a basic barrier

Pros

Elasticized strap holds the cover snug against the unit
Polyethylene resists cracking and mildew
Three sizes matched to BTU range for a closer fit
Slips on and off in seconds with no tools
Light and easy to store when the season ends

Cons

Thin 6 mil plastic offers little insulation or padding
Only three sizes, so odd unit dimensions may fit loosely
No rigid frame or vents; trapped moisture needs checking
Grey plastic look is purely functional

Frost King Air Conditioner Cover prices at every store

The Home DepotNew
In stock
$5.68Free shippingChecked Nov 10
Visit The Home Depot
eBayNew
In stockSold by anewplayerintown
$6.50+ $7.95 shippingChecked Nov 10
Visit eBay
WalmartNew
In stockSold by Supply the Home
$14.97Free shippingChecked Nov 10
Visit Walmart
PoshmarkNew
In stock
$14.00+ $6.49 shippingChecked Nov 10
Visit Poshmark
filingsupplies.comNew
In stock
$6.29+ $14.95 shippingChecked Nov 10
Visit filingsupplies.com

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Frost King Air Conditioner Cover price history

Lowest price we've seen: $5.68 on Nov 10 at The Home Depot. Tracked across 5 stores since Nov 10.

What reviewers say

Buyers treat it as a cheap seasonal barrier that does its job: it keeps rain, snow and drafts off a window unit and goes on fast. The common complaints are thin material and a fit that can run loose on units that do not match the listed dimensions.

What people mention

BuildMixedOwners find the plastic thin but say it survives a winter without cracking.
FitMixedThe elastic strap helps, but some units sit loosely inside the listed dimensions.
Weather protectionPraisedBuyers say it keeps rain, snow and wind off the unit through the off-season.
InsulationCriticisedReviewers note it blocks drafts but adds little warmth compared with padded covers.
SetupPraisedIt goes on and comes off in seconds with no tools.

From Poshmark

Durable Window Air Conditioner Cover
Ensures the unit stays safe from the elements
Gray color
New With Tags

Sizes: 18” High/27” Width/16” D
Guarantee: Posh Protect: get your order as described or receive your money back.
Returns: Posh Protect: get your order as described or receive your money back.

About the Frost King Air Conditioner Cover

The Frost King Window Air Conditioner Cover protects a window A/C unit from damage caused by winter weather. Covering the unit also helps reduce drafts and heat loss.

The cover is made of heavy-gauge plasticized polyethylene fabric that does not crack or mildew. It is 6 mil thick and rectangular. An elasticized strap is included for a tight, secure fit.

Material: Polyethylene, 6 mil thick
Color: Grey
Shape: Rectangle
Model AC2H: 27 in. W x 18 in. H x 16 in. D; for units up to 10,000 BTU
Model AC3H: 27 in. W x 18 in. H x 22 in. D; for units from 10,000 to 15,000 BTU
Model AC5H: 28 in. W x 20 in. H x 30 in. D; for units 15,000 BTU and up
Closure: Elasticized strap
Quantity: 1 cover per package
Package: Bag

Questions and answers

Which size fits my window A/C?: Match the cover to the unit's BTU rating: AC2H for up to 10,000 BTU, AC3H for 10,000 to 15,000 BTU, and AC5H for 15,000 BTU and up. Check the unit's width, height and depth against the listed dimensions before choosing.
Does it insulate the unit?: Only lightly. The 6 mil polyethylene blocks wind, rain and snow and reduces drafts, but it has no padding, so do not expect it to keep the room warm on its own.
Can I leave it on all winter?: Yes, that is its purpose. The maker says the fabric will not crack or mildew, but check for trapped moisture after wet spells and dry the unit before the season starts.
Will it fit a unit that is not exactly the listed size?: The elasticized strap pulls the cover tight, so a slightly smaller unit can work. A unit larger than the listed dimensions will not be covered properly.
Do I need to remove the A/C unit first?: No. The cover goes over the unit while it stays in the window, which is the point for people who leave the unit installed year-round.
Is it better than a canvas cover?: It is lighter and simpler to fit, but canvas and insulated covers add padding and warmth that this plastic shell does not. Choose this one for basic weather and draft blocking.
Where is the Frost King Air Conditioner Cover cheapest?: At The Home Depot, for $5.68, as of our latest check.
Where can I buy the Frost King Air Conditioner Cover?: 5 stores we checked sell it, including filingsupplies.com, eBay, Poshmark, Walmart, The Home Depot.