Thermwell AC14H Foam Ac Side Panel 9x18 Replacement Pair

Product Description

The THERMWELL AC14H is a pair of thick foam side panels designed to seal the gaps on either side of a window-mounted room air conditioner. These panels block outdoor air, insects, and moisture from entering around the unit, helping the AC maintain its set temperature without working harder than needed. Each panel measures 9 inches wide by 18 inches tall by 0.875 inches thick. Self-stick side channels are included, allowing the panels to be secured to the window frame without additional hardware. This kit is a direct replacement for worn, torn, or missing factory foam accordion panels typically found on indoor window AC installations.

This product is suited for residential window air conditioner installations where the original foam side accordion panels have deteriorated or are no longer sealing properly. The panels fill the open space between the extended AC chassis and the window frame. They are commonly installed during seasonal AC setup by homeowners, maintenance technicians, or property managers servicing window units in apartments, offices, and single-family homes. The included self-stick channels simplify reinstallation without requiring professional tools.

Key Features

• Sold as a pair — covers both sides of a standard window AC unit
• Thick foam construction provides a firm seal against drafts, insects, and moisture
• Panel dimensions: 9 inches x 18 inches x 0.875 inches per panel
• Self-stick side channels included for tool-free attachment to window frame
• Designed as a drop-in replacement for factory-installed accordion foam side panels

Compatibility

Designed as an OEM-style replacement for indoor window-mounted room air conditioner foam side panels where the opening requires panels approximately 9 inches wide by 18 inches tall.

Installation Notes

Installation does not require electrical trade certification but should be performed with the air conditioner unplugged or powered down at the outlet. Clean and dry the window frame channels before applying the self-stick backing to ensure a lasting bond. Verify the panel dimensions match the gap on each side of the installed unit before trimming or fitting. Do not force panels into undersized openings, as compression beyond the designed thickness may compromise the seal.