How To Seal Around Window Air Conditioner Jun 2026

As the summer months approach, many of us rely on window air conditioners to keep our homes cool and comfortable. However, if not properly sealed, these units can let hot air in and cold air out, increasing your energy bills and reducing the efficiency of your air conditioner. In this post, we'll show you how to seal around a window air conditioner to keep your home cool and save you money.

Factory panels often warp or leave gaps. how to seal around window air conditioner

| Category | Items | |----------|-------| | | Window AC unit (installed), measuring tape, scissors, utility knife | | Sealing Materials | Weather-sealing foam (closed-cell, 1.5–2 inches wide), adhesive-backed foam tape (thin), silicone caulk (for permanent gaps) | | Structural Support | L-bracket or support bracket (for heavy units), wood shims | | Finish & Security | White duct tape or foil tape, locking window clamp or vinyl window lock | As the summer months approach, many of us

Sealing around a window air conditioner is crucial for several reasons: Factory panels often warp or leave gaps

Sealing around a window air conditioner is a simple and effective way to improve its efficiency, reduce energy costs, and prevent moisture and pest issues. By following these steps and using the right materials, you can enjoy a cooler and more comfortable home without breaking the bank.