[Lifetime Warranty] Window Air Conditioner Cover Indoor with Velcro Sides - Inside AC Cover for Winter - Polyester Fiber Fill Layers Insulation - 21" x 15" x 3.5" - Black
Black quilted indoor window air conditioner cover with insulated polyester fiber fill and side drawstring.
Black quilted indoor window air conditioner cover installed on a unit in a window.
Black quilted indoor window air conditioner cover showing product dimensions of 21 x 15 x 3.5 inches.
Infographic showing triple-layer insulation design of indoor window air conditioner cover with polyester fiber fill.
Black indoor window AC cover showing adjustable strap, plastic lock, and secure fit features.
Black indoor window AC cover showing pre-cut side holes for electrical cables with Velcro fasteners.
Black quilted indoor window air conditioner cover for winter insulation installed on a window AC unit.
Black indoor window air conditioner cover with 3-layer insulated design and cable access holes.
Black quilted indoor window air conditioner cover with insulated polyester fiber fill and side drawstring.
Black quilted indoor window air conditioner cover installed on a unit in a window.
Black quilted indoor window air conditioner cover showing product dimensions of 21 x 15 x 3.5 inches.
Infographic showing triple-layer insulation design of indoor window air conditioner cover with polyester fiber fill.
Black indoor window AC cover showing adjustable strap, plastic lock, and secure fit features.
Black indoor window AC cover showing pre-cut side holes for electrical cables with Velcro fasteners.
Black quilted indoor window air conditioner cover for winter insulation installed on a window AC unit.
Black indoor window air conditioner cover with 3-layer insulated design and cable access holes.
Lifetime Warranty

[Lifetime Warranty] Window Air Conditioner Cover Indoor with Velcro Sides - Inside AC Cover for Winter - Polyester Fiber Fill Layers Insulation - 21" x 15" x 3.5" - Black

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Indoor Window Air Conditioner Cover (21" x 15" x 3.5")

Key Features

  • Interior cover designed to block drafts and prevent heat loss during off-seasons.
  • Constructed from durable polyester fabric for long-term use.
  • Features an elastic border or drawstring for a secure, sealed fit.
  • Helps keep dust, moisture, and debris from entering the room through the unit.
  • Color: Black
  • Dimensions (L x H x D): 21 in x 15 in x 3.5 in

Replaces / Cross-Reference Part Numbers

  • This is a universal cover, not a direct replacement for a specific manufacturer part number.
  • Intended for any brand of window air conditioner matching the specified dimensions.

Compatibility & Fitment

  • Fits most standard window air conditioner units with face dimensions from 19"-21" (Length) x 13"-15" (Height).
  • Compatible with many 10,000 to 12,000 BTU window units.
  • Verify your air conditioner's indoor unit dimensions prior to purchase to ensure proper fit.

When to Replace

  • Replace if the current cover is torn, punctured, or frayed.
  • If the material has degraded and no longer provides an effective seal against drafts.
  • When the elastic or drawstring mechanism is stretched out or broken, preventing a secure fit.

Installation Tips

  • Ensure the air conditioner is powered off before covering the unit.
  • Wipe down the face of the AC unit to remove any dust or debris.
  • Position the cover over the front of the indoor unit.
  • Pull the edges to ensure it is fully seated around the unit's frame.
  • Tighten the integrated securing mechanism to create a firm seal against the wall or window frame.
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  • Designed for lasting satisfaction

    Designed for lasting satisfaction

    Our indoor window AC cover features three tough layers: 210D PVC, Silk Wadding, and 190T Polyester Taffeta. These materials make it strong, insulating, and windproof. This means your AC unit stays safe, your energy bills stay low, and your AC lasts longer.
  • Versatile Velcro Side for Cable Management

    Versatile Velcro Side for Cable Management

    Featuring two side openings with adjustable Velcro flaps, this design allows air conditioner cables to easily pass through, whether positioned on the left or right side. When not in use, the flaps securely close to ensure a sleek, streamlined appearance.
  • Keep the cold out and Prevent warm air leaks

    Keep the cold out and Prevent warm air leaks

    You can enjoy the comfort of a draft-free, warm space while significantly reducing your energy bills. By sealing your space effectively, you not only experience enhanced comfort but also achieve improved energy efficiency, making it a smart choice for both your comfort and your wallet.
  • Clean, Cozy, Efficient: Our All-in-One Solution

    Clean, Cozy, Efficient: Our All-in-One Solution

    Our Window AC Cover is a versatile solution. It's dustproof, keeping your space clean. It's windproof, no more drafts. Cleaning is easy, just wipe. It blocks cold air, saving energy and keeping you warm.
Item Weight
‎7.4 ounces
Product Dimensions
‎21 x 15 x 3.5 inches
Size
‎6000 - 8000 BTU
Color
‎Black
Material
‎210D PVC, POLYESTER FIBER PADDED, and 190T Polyester Taffeta
Included Components
‎BlueStars Window Indoor AC Cover

FAQ

This cover is sized 17" x 13" x 3.5" and is intended for indoor use on smaller window air conditioner front panels. The best fit is usually on units with a face close to those dimensions. Measure the visible indoor portion of your window AC before ordering, especially the width, height, and depth of the front cover area.
This is an indoor cover, designed to go over the room-facing side of the window air conditioner during colder months. It helps reduce drafts and can add a layer of insulation from cold air entering around the unit.
The Velcro side closures help the cover wrap around the front portion of the air conditioner for a more secure fit. They also make installation and removal easier, especially if the unit has slightly different side contours or protrusions.
An indoor AC cover can help reduce cold drafts, heat loss, dust buildup, and airflow coming through the front vents of a window air conditioner when the unit is not being used. It can also help keep the unit cleaner during the off-season.
Installation is usually simple and takes only a few minutes. Turn the air conditioner off, clean and dry the front surface, place the cover over the indoor face of the unit, and secure the Velcro sides so it sits snugly. No tools are typically required.
It is not brand-specific. Fit depends more on the shape and dimensions of the indoor face of your window air conditioner than on the brand name. Compare your unit's measurements to the 17" x 13" x 3.5" cover size to judge compatibility.
Before installing the cover, make sure the air conditioner is turned off, unplugged if practical, and clean. It is a good idea to remove dust from the front grille and filter area first. Also check that the unit is dry so moisture is not trapped behind the cover.
No. The cover should be removed before operating the window air conditioner. Running the unit with the cover installed can block airflow and may affect performance or damage the equipment.