---
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: "KSh9024"
currency: KES
in_stock: true
reviews_count: 8
category: "Thermwell"
url: https://www.desertcart.co.ke/products/16882158-thermwell-frost-king-ac43h-air-conditioner-weatherseal-tape-2-1
store_origin: KE
region: Kenya
---

# 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:** KSh9024
**Availability:** ✅ In Stock

## Summary

> 🛠️ Upgrade your AC seal game — block drafts, noise & bugs like a boss!

## 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?** KSh9024 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.ke](https://www.desertcart.co.ke/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 temperature swings and vibrations.
- • **Seal Like a Pro:** Dense open-cell foam blocks drafts, dust, and pests effortlessly.
- • **Perfect Fit Every Time:** Compressible 2.25" thickness adapts to uneven window AC gaps without tearing.
- • **Easy, No-Fuss Installation:** Strong adhesive sticks securely without extra reinforcement.
- • **Multi-Purpose Weather Defense:** Ideal for window ACs and cable passthroughs, keeping your space insulated and quiet.

## Overview

The THERMWELL Frost King AC43H Weatherseal Tape is a 42-inch long, 2.25-inch thick open-cell foam strip designed to seal gaps around window air conditioners. Its resilient, compressible material effectively blocks air leaks, dust, and insects while reducing noise and vibration. Easy to install with strong adhesive, it maintains shape over time and temperature changes, making it a reliable upgrade for improved insulation 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 for Starlink Cable Passthrough - I purchased this to protect my startlink cable I have running through the window and to block out the outside. I folded over a piece so the cable was sandwiched and this put another piece up where the windows separate. As for insulation, we had a cold snap here in Virginia and it I felt no air or coldness making it through. Also, it seems to protect the cable quite well rather than letting wood press directly against it. I was going to make this a temporary setup but see no need to change it. The weather seal is working just fine.

## 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 | #6,142 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #44 in Weather Stripping |
| Brand | Thermwell |
| Color | Gray |
| Customer Reviews | 4.6 4.6 out of 5 stars (3,109) |
| 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/81dtEN7daQL.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 for Starlink Cable Passthrough
*by K***N on February 11, 2026*

I purchased this to protect my startlink cable I have running through the window and to block out the outside. I folded over a piece so the cable was sandwiched and this put another piece up where the windows separate. As for insulation, we had a cold snap here in Virginia and it I felt no air or coldness making it through. Also, it seems to protect the cable quite well rather than letting wood press directly against it. I was going to make this a temporary setup but see no need to change it. The weather seal is working just fine.

### ⭐⭐⭐⭐⭐ 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!

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*Product available on Desertcart Kenya*
*Store origin: KE*
*Last updated: 2026-03-07*