--- product_id: 16882158 title: "THERMWELL Frost King AC43H Air Conditioner Weatherseal Tape, 2-1/4 by 2-1/4 by 42-Inch" brand: "thermwell" price: "539620β‚«" currency: VND in_stock: true reviews_count: 8 category: "Thermwell" url: https://www.desertcart.vn/products/16882158-thermwell-frost-king-ac43h-air-conditioner-weatherseal-tape-2-1 store_origin: VN region: Vietnam --- # 42-inch length for versatile coverage Compressible foam reduces noise & vibration Resilient foam seals air, dust & insects THERMWELL Frost King AC43H Air Conditioner Weatherseal Tape, 2-1/4 by 2-1/4 by 42-Inch **Brand:** thermwell **Price:** 539620β‚« **Availability:** βœ… In Stock ## Summary > πŸ› οΈ Upgrade your AC seal game β€” keep cool, quiet, and draft-free! ## Quick Answers - **What is this?** THERMWELL Frost King AC43H Air Conditioner Weatherseal Tape, 2-1/4 by 2-1/4 by 42-Inch by thermwell - **How much does it cost?** 539620β‚« with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/16882158-thermwell-frost-king-ac43h-air-conditioner-weatherseal-tape-2-1) ## Best For - thermwell enthusiasts ## Why This Product - Trusted thermwell brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Built to Last:** Foam rebounds to original shape, resisting flattening and wear over time - β€’ **Seal Like a Pro:** Dense, open-cell foam creates an airtight barrier against drafts and pests - β€’ **Perfect Fit Every Time:** Compressible 2.25" thickness adapts seamlessly to uneven window AC gaps - β€’ **Effortless Installation:** Generous 42" length covers multiple gaps with secure adhesion (requires your own tape) - β€’ **Noise & Vibration Control:** Dampens annoying AC vibrations for a quieter, more comfortable space ## Overview The THERMWELL Frost King AC43H Weatherseal Tape is a 42-inch long, 2.25" thick open-cell foam strip designed specifically for window air conditioners. It provides a resilient, compressible seal that blocks air leaks, dust, and insects while reducing noise and vibration. Durable and easy to install, it maintains its shape through temperature changes and daily use, making it a top-rated choice for improving AC efficiency and comfort. ## Description Product Description 2-1/4" x 2-1/4" x 42", Dark Gray, Open Cell Foam Tape, For Weather-Stripping Around Window Air Conditioners, A Resilient, Compressible Strip For Sealing Out Air, Insects & Dust.Do not use it on paint or wallpaper. Manufacturer Contact Information 1-800-526-5265 Review: A Solid Weatherseal Upgrade for Window Air Conditioners - The THERMWELL Frost King AC43H Air Conditioner Weatherseal Tape is a simple but highly effective solution for sealing window AC units and eliminating the drafts, vibration noise, and dust gaps that tend to show up around older installations. The foam is dense enough to provide a firm, reliable seal, yet still compresses easily to fit uneven gaps without tearing or crumbling. At 2‑1/4 by 2‑1/4 inches and 42 inches long, the size is generous and works well for both side and top gaps on standard window units. During installation, the adhesive held securely without needing reinforcement, and once in place, the foam stayed put even through temperature swings and daily AC vibration. The material also rebounds well, maintaining its shape rather than flattening out over time. For anyone installing a new unit or tightening up an existing one, this weatherseal tape offers dependable performance, easy handling, and a noticeable improvement in insulation and noise reduction. Review: Good insulation foam - Initially seems like it's too lightweight to work, but once you squeeze it in there it works pretty well. Cuts down on noise, super easy to work with, good price. Note that it doesn't self-adhere, you need to bring your own tape if you want that. ## Features - For Weather-Stripping Around Window Air Conditioners - Resilient, Compressible Strip For Sealing Out Air, Insects & Dust - Open Cell Foam Tape ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0000DH4JL | | Best Sellers Rank | #521 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Weather Stripping | | Brand | Thermwell | | Brand Name | Thermwell | | Color | Gray | | Customer Reviews | 4.7 out of 5 stars 3,259 Reviews | | Global Trade Identification Number | 00077578030401 | | Included Components | Foam Insulation | | Item Dimensions L x W | 42"L x 2.25"W | | Item Thickness | 2.25 Inches | | Item Type Name | Frost King AC43H Air Conditioner Weatherseal Tape, 2-1/4 by 2-1/4 by 42-Inch | | Item Weight | 0.01 Ounces | | Manufacturer | Thermwell Products Co., Inc | | Manufacturer Contact Information | 1-800-526-5265 | | Manufacturer Part Number | AC43H | | Manufacturer Warranty Description | Manufacturer's warranty against defects. | | Material | Foam | | Material Type | Foam | | Model Number | AC43H | | Number of Items | 1 | | Product Dimensions | 42"L x 2.25"W | | Recommended Uses For Product | Window | | UPC | 077578030401 | | Unit Count | 3.5 Feet | ## Product Details - **Brand:** Thermwell - **Color:** Gray - **Item Thickness:** 2.25 Inches - **Material:** Foam - **Product Dimensions:** 42"L x 2.25"W ## Images ![THERMWELL Frost King AC43H Air Conditioner Weatherseal Tape, 2-1/4 by 2-1/4 by 42-Inch - Image 1](https://m.media-amazon.com/images/I/81dtEN7daQL.jpg) ![THERMWELL Frost King AC43H Air Conditioner Weatherseal Tape, 2-1/4 by 2-1/4 by 42-Inch - Image 2](https://m.media-amazon.com/images/I/91XYNoEraKL.jpg) ![THERMWELL Frost King AC43H Air Conditioner Weatherseal Tape, 2-1/4 by 2-1/4 by 42-Inch - Image 3](https://m.media-amazon.com/images/I/81MfpSaOC9L.jpg) ![THERMWELL Frost King AC43H Air Conditioner Weatherseal Tape, 2-1/4 by 2-1/4 by 42-Inch - Image 4](https://m.media-amazon.com/images/I/81VaoALvX-L.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: can the weatherseal go between the bottom of the air conditioner and the window sill?)** A: If there is space then yes. It’s a foam so you can manipulate it into the smallest crevices. **Q: does it absorb moisture?** A: Never had to experience moisture **Q: What is the maximum temperature rating of this foam?** A: Sorry, no idea. I use it for insulation. It does not come with temperature ratings listed, but as it's very light, thick sponge rubber I wouldn't think it would withstand very high heat. **Q: Is it washable?** A: It can be hand-washed in mild soapy water' rinsed and air-dried as long as the foam has not gotten crumbly with age. ## Customer Reviews ### ⭐⭐⭐⭐⭐ A Solid Weatherseal Upgrade for Window Air Conditioners *by M***8 on January 3, 2026* The THERMWELL Frost King AC43H Air Conditioner Weatherseal Tape is a simple but highly effective solution for sealing window AC units and eliminating the drafts, vibration noise, and dust gaps that tend to show up around older installations. The foam is dense enough to provide a firm, reliable seal, yet still compresses easily to fit uneven gaps without tearing or crumbling. At 2‑1/4 by 2‑1/4 inches and 42 inches long, the size is generous and works well for both side and top gaps on standard window units. During installation, the adhesive held securely without needing reinforcement, and once in place, the foam stayed put even through temperature swings and daily AC vibration. The material also rebounds well, maintaining its shape rather than flattening out over time. For anyone installing a new unit or tightening up an existing one, this weatherseal tape offers dependable performance, easy handling, and a noticeable improvement in insulation and noise reduction. ### ⭐⭐⭐⭐⭐ Good insulation foam *by Z***R on April 8, 2026* Initially seems like it's too lightweight to work, but once you squeeze it in there it works pretty well. Cuts down on noise, super easy to work with, good price. Note that it doesn't self-adhere, you need to bring your own tape if you want that. ### ⭐⭐⭐⭐⭐ A MUST FOR WINDOW AIR CONDITIONERS *by P***K on May 28, 2026* This sponge stuffer is a MUST for around my window air conditioners & between the windows. Keeps BUGS OUT!!! Necessary to buy it every year, but it's well worth the price, but I wish they did offer a bigger bag. HIGHLY recommend this weather seal, no creepy crawlers in this house! ## Frequently Bought Together - THERMWELL Frost King AC43H Air Conditioner Weatherseal Tape, 2-1/4 by 2-1/4 by 42-Inch - Frigidaire 6,000 BTU Window Air Conditioner with Remote Control, Cools Up to 250 Sq. Ft., Quiet Operation, Eco Mode, 3 Fan Speeds, Auto Restart, White - Breeze Stop Surround Insulation Side Panels White for Window AC Unit Indoor Air Conditioner Cover for Winter and Summer --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vn/products/16882158-thermwell-frost-king-ac43h-air-conditioner-weatherseal-tape-2-1](https://www.desertcart.vn/products/16882158-thermwell-frost-king-ac43h-air-conditioner-weatherseal-tape-2-1) --- *Product available on Desertcart Vietnam* *Store origin: VN* *Last updated: 2026-06-05*