How to Drill Holes in a Double Pane Window Frame to Vent

A double-pane window has two pieces of glass inside of the window’s frame with a small gap separating the two pieces. Because of the gap, the windows can fog up on the inside, between the two panes of glass. Drilling two small holes into the interior side of the glass will allow air to flow between the two pieces of glass, preventing them from fogging. Once you have the holes in the glass, you will also be able to clean the glass panes.

Double-pane windows can fog up because of trapped moisture.

Step 1

Insert a 1/8-inch drill bit into your drill.

Step 2

Pour cold water into a spray bottle.

Step 3

Drill a 1/8-inch hole into the top corner of the windowpane. Spray the drill bit with the cold water, as you are drilling, to keep the bit cool. Keeping the bit cool will prevent the glass from cracking as you drill.

Step 4

Drill an additional 1/8-inch hole in the lower corner of the windowpane by following the same directions.

Step 5

Leave the holes open to allow ventilation or cover them with a piece of tape to close off the vents.