Thermwell AC18H Window Ac Side Panel Kit 12x21 in 2 Pack

Product Description

The THERMWELL AC18H is a flexible vinyl side panel kit designed to seal the gaps on either side of a window-mounted air conditioner. Each kit includes two panels sized at 12 inches by 21 inches, providing enough material to cover both sides of a standard window AC installation. The flexible vinyl construction allows the panels to be cut to size using ordinary household scissors, making field fitting straightforward. This kit is intended to reduce drafts, dust infiltration, and moisture intrusion around the perimeter of the unit where the accordion-style factory panels have deteriorated or gone missing.

This kit is suited for residential window air conditioner installations where the original side panels have worn out, torn, or lost their sealing ability over time. It works with standard single- and double-hung window installations where a room air conditioner is fitted into the window frame. Homeowners and HVAC service technicians commonly use this type of kit as a maintenance replacement item during seasonal AC preparation or post-installation cleanup.

Key Features

• Two panels per kit, each measuring 12 inches by 21 inches
• Flexible vinyl material cuts easily with household scissors for custom sizing
• Replaces worn or damaged OEM-style accordion side panels
• Helps reduce drafts, airborne dust, and moisture infiltration around the AC unit
• No special tools required for installation

Compatibility

Designed as a general-purpose replacement side panel kit for residential window air conditioner installations where the existing side panels require replacement.

Installation Notes

Installation does not require electrical shutoff, but the AC unit should be turned off before handling or repositioning it in the window frame. Cut each panel to the required width and height using standard household scissors before fitting into the window frame side channels. Ensure panels are seated snugly against both the window frame and the AC cabinet to maintain an adequate draft and moisture seal. This is a homeowner- or technician-level task that requires no specialized trade tools.