How To Seal A Window Air Conditioner [ Top 20 DELUXE ]

If you have no supplies on hand and need a temporary seal for one night: roll up a towel and wedge it between the top of the AC and the window sash. Remove it when you run the AC (blocks airflow), and only use for 1–2 days.

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Choosing the right material depends on whether you want a permanent or seasonal fix: If you have no supplies on hand and