---
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: "124.20 DT"
currency: TND
in_stock: true
reviews_count: 8
category: "Thermwell"
url: https://www.desertcart.tn/products/16882158-thermwell-frost-king-ac43h-air-conditioner-weatherseal-tape-2-1
store_origin: TN
region: Tunisia
---

# Compressible & resilient for uneven gaps 42-inch length for versatile coverage Dense 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:** 124.20 DT
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal the deal on comfort and style with THERMWELL Frost King!

## 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?** 124.20 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/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

- • **Built to Last:** Foam rebounds and maintains shape despite daily vibrations and temperature swings—no sagging, no slipping.
- • **Seal Like a Pro:** Dense open-cell foam blocks drafts, dust, and pesky insects for a pristine indoor vibe.
- • **Upgrade Your Comfort:** Reduce noise, improve insulation, and keep your space fresh and draft-free all year round.
- • **Fits Perfectly Every Time:** Generous 2.25" x 2.25" cross-section compresses to fill irregular gaps around window AC units effortlessly.
- • **Quick & Clean Installation:** Strong adhesive backing sticks securely without extra tools or fuss—get your weatherseal done in minutes.

## Overview

The THERMWELL Frost King AC43H Weatherseal Tape is a 42-inch long, 2.25" thick open-cell foam strip designed specifically for sealing gaps around window air conditioners. Its resilient, compressible foam blocks air, dust, and insects while reducing noise and drafts. Easy to install with strong adhesive backing, it maintains shape through temperature changes and vibrations, making it a durable upgrade for any window AC setup.

## 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: Excellent for Sealing Space Between Windows After AC Installation - I purchased this to fill the space between two windowpanes in a side-to-side sliding window after installing a window air conditioner. There was about an inch of space between the panes in a high wind area with typical winds of 20mph and frequent 30mph gusts in normal weather conditions. Everything I tried quite literally blew right out of place. I decided to give this a try and ordered the 2-1/4 inch size, so that I had plenty of room to squish it down and let it expand into place. It worked great! It was easy to install. I just pressed it down as sliding into place a little at a time and then adjusted it to make sure it was straight and aligned with the window to ensure it looks nice. The foam is sturdy, yet easy to squish to install. It took less than 5 minutes to seal both window spaces inside and outside. It expanded into place and is tightly packed. The winds (and dirt they bring) don't stand a chance!

## 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 |
| Assembly required | No |
| Batteries required | No |
| Best Sellers Rank | #2,548 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #47 in Weather Stripping |
| Brand | Thermwell |
| Color | Gray |
| Customer Reviews | 4.6 4.6 out of 5 stars (2,879) |
| Global Trade Identification Number | 00077578030401 |
| Included Components | Foam Insulation |
| Is Discontinued By Manufacturer | No |
| Item Thickness | 2.25 Inches |
| Item Weight | 0.01 ounces |
| Item model number | AC43H |
| Manufacturer | Thermwell Products Co., Inc |
| Material | Foam |
| Number of Items | 1 |
| Perfume | Unscented |
| Product Dimensions | 42"L x 2.25"W |
| Recommended Uses For Product | Window |
| UPC | 077578030401 |
| Unit Count | 3.5 Feet |
| Warranty Description | Manufacturer's warranty against defects. |

## 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/41Fhn7H6oCL.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/41HDQ6jZ5PL.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/41TjINr+7YL.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/41nsovGBG7L.jpg)
![THERMWELL Frost King AC43H Air Conditioner Weatherseal Tape, 2-1/4 by 2-1/4 by 42-Inch - Image 5](https://m.media-amazon.com/images/I/717wpUtDjaL.jpg)

## 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.

### ⭐⭐⭐⭐⭐ Excellent for Sealing Space Between Windows After AC Installation
*by L***F on September 25, 2025*

I purchased this to fill the space between two windowpanes in a side-to-side sliding window after installing a window air conditioner. There was about an inch of space between the panes in a high wind area with typical winds of 20mph and frequent 30mph gusts in normal weather conditions. Everything I tried quite literally blew right out of place. I decided to give this a try and ordered the 2-1/4 inch size, so that I had plenty of room to squish it down and let it expand into place. It worked great! It was easy to install. I just pressed it down as sliding into place a little at a time and then adjusted it to make sure it was straight and aligned with the window to ensure it looks nice. The foam is sturdy, yet easy to squish to install. It took less than 5 minutes to seal both window spaces inside and outside. It expanded into place and is tightly packed. The winds (and dirt they bring) don't stand a chance!

### ⭐⭐⭐⭐⭐ Great product for insulation!!
*by W***N on September 10, 2025*

Arrived as stated and does the job I bought it for. I use these for around my window a/c unit but I also live in a VERY old apt that has many cracks! These can be cut easily for use in sealing cracks around old windows in conjunction with the plastic I also use and these work wonderfully. Easy to install and I suggest the grey. Good quality! Good packaging! Great seller! Recommend!!

## Frequently Bought Together

- THERMWELL Frost King AC43H Air Conditioner Weatherseal Tape, 2-1/4 by 2-1/4 by 42-Inch
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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-01-28*