Best Through the Wall Air Conditioner Covers for Winter
Choosing the right cover helps prevent cold drafts, moisture, and debris from breaching window or through-the-wall air conditioning units during winter. This guide reviews five top-rated options designed to block wind, conserve energy, and protect units from snow and rain. Below is a quick summary of our picks to help you compare at a glance.
| Product | Brand | Size Fit | Key Benefit | Amazon Link |
|---|---|---|---|---|
| LITHESOMER Window Air Conditioner Insulation Cover | LITHESOMER | 21.1″ L × 15″ H × 16″ D | Three-layer insulation; windproof & waterproof | https://www.amazon.com/dp/B0BC6ZHSVS?tag=hvacreviewer-20 |
| 2 Pack Indoor Outdoor Window AC Covers | BEWAVE | 25″ × 17″ × 3.5″ (indoor) / 25.5″ × 20.5″ × 18″ (outdoor) | Dual-layer protection; adjustable straps | https://www.amazon.com/dp/B0B7MXNF9Z?tag=hvacreviewer-20 |
| AC2H Window A/C Cover | Thermwell | 18″ × 27″ × 16″ | Durable polyethylene; blocks water and dust | https://www.amazon.com/dp/B0000DH4JK?tag=hvacreviewer-20 |
| COSFLY Indoor Window A/C Cover | COSFLY | 25″ × 18″ × 3.5″ | Indoor protection; easy install | https://www.amazon.com/dp/B0B4DCQH94?tag=hvacreviewer-20 |
| TOHONFOO Third-Party Outdoor Cover | TOHONFOO | 21″ × 16″ × 15″ | Three-layer insulation; adjustable bottom cut | https://www.amazon.com/dp/B0CFZRC1NS?tag=hvacreviewer-20 |
The following sections break down each product’s features, materials, and suitability for winter protection on either window or through-the-wall configurations. Each entry stays concise to aid quick comparison while providing practical details for informed purchasing decisions.
LITHESOMER Window AC Insulation Cover
The LITHESOMER window AC insulation cover features a three-layer construction designed to block cold air from entering the unit. Its outer layer uses high-density waterproof oxford cloth, followed by an EPE foam insulating layer and a protective aluminum foil layer. This combination provides windproof and waterproof protection, helping to conserve energy during winter without removing the unit. It also offers a cuttable bottom design to fit units with brackets, simplifying installation for various configurations.
Materials chosen aim to resist leaves, rain, snow, dust, and UV exposure while maintaining flexibility for different window setups. The cover is designed for exterior use, so it can shield a window unit from environmental elements throughout the season. The cuttable bottom allows bracket compatibility, a practical feature for owners with units that have supports beneath the unit.
2 Pack Indoor Outdoor Window AC Covers
The BEWAVE set includes two covers designed for both indoor and outdoor use. The indoor cover is made of 210D polyester and cotton, while the outdoor cover uses 210D waterproof oxford cloth, providing dual-layer protection against dust and moisture. The design emphasizes wind and weather resistance, preventing drafts from entering the unit. A notable feature is machine washable capability, enabling easy maintenance and reuse over multiple winters.
Installation is tool-free and straightforward: the indoor cover includes a drawstring for tightening, while the outdoor cover features two adjustable strap buckles for a snug fit. The design also accommodates the AC power cable with bottom corner holes on the indoor cover, preserving access while protecting the unit. The combination of indoor and outdoor protection makes this model versatile for varied installation scenarios.
Thermwell AC2H Window A/C Cover
The Thermwell AC2H cover focuses on simple, durable protection for window units. Made from durable polyethylene, it provides a weatherproof barrier against water, ice, dust, and leaves while remaining easy to install. The cover is designed to be long-lasting through winter and beyond, helping reduce maintenance needs for outdoor window units. It is suited for standard window air conditioners, with a straightforward profile that covers the exterior portion of the unit.
With a silver finish, the AC2H cover emphasizes durability and weather resistance. It is a practical option for homeowners seeking a durable, low-maintenance cover that can withstand winter conditions without added complexity. The cover’s material choice contributes to resilience against punctures and tears, important for debris-prone climates.
COSFLY Indoor Air Conditioner Cover
The COSFLY cover is designed for indoor use, sized at 25 x 18 x 3.5 inches to fit many window AC units. Made from 210D polyester/cotton, it offers wind and cold air draft protection while sealing the unit from the inside. This model is particularly suited for keeping heat inside during winter and can function for wall-mounted units with compatible dimensions.
Installation is tool-free; simply slip the cover over the AC unit. An internal elastic and side drawstrings provide a snug fit to minimize drafts and ensure a tight seal. The cover is described as both protective and aesthetically appealing, making it a practical option for those prioritizing interior air retention and a tidy appearance during the winter months.
TOHONFOO Outdoor AC Cover
TOHONFOO’s outdoor cover features a three-layer insulation approach with 600D waterproof and windproof oxford fabric, a 2mm thickened pearl cotton layer, and insulated aluminum foil. Its inner dimensions are 21″W × 16″D × 15″H, aligning with many standard outside AC units. A bottom-cut design allows customization to brackets underneath the unit, enabling a precise fit for installations with support structures. The multilayer construction aims to block drafts while maintaining durability in harsh winter conditions.
Buying Guide: Key Purchase Considerations
- Size and fit: Measure your unit (width, height, depth) and compare to product inner dimensions. Look for covers with adjustable or cuttable bottoms to accommodate brackets or uneven surfaces.
- Layering and materials: Three-layer designs with waterproof outer fabrics and insulating cores offer better draft protection. Consider whether a cover is intended for indoor or outdoor use, as this affects material durability and UV resistance.
- Installation and access: Check if covers provide easy installation without tools and whether they allow access to cables or vents. Drawstrings or straps help achieve a snug fit and prevent wind from lifting the cover.
- Durability and maintenance: Reusable, machine-washable options save time. Durable fabrics resist tearing from winter debris, and coatings should withstand cold temperatures without becoming brittle.
- Energy efficiency: A well-fitting cover reduces heat loss and drafts around the unit, contributing to lower energy usage and a warmer indoor environment during winter.
- Care instructions and warranty: Review whether the product requires special cleaning and whether the manufacturer offers a warranty or replacement policy for winter use.