How to Insulate Windows With Casement Air Conditioners

Gaps between your air conditioner and window allow warm air to enter, making the air conditioner work harder to cool your room and costing you more money. Insulating around the window air conditioner seals these gaps and keeps the warm air out and the cool air in. If you visit your local hardware store, you will find many products aimed at insulating around your air conditioner. These products are inexpensive and quick to install.

Air conditioner insulating foam pad
Scissors
Tape measure
Foam backer rod
Pipe insulation
Clear vinyl tape

Instructions

- 1
  Hold an air conditioner insulating foam pad next to the window air conditioner. Cut the pad with a scissors to fit the space between the air conditioner and the window frame. Peel off the insulation's paper backing and stick it in place. Repeat this step on the air conditioner's other side.
- 2
  Measure the length of any gaps running above or below the casement window air conditioner. Cut foam backer rod with a scissors to match these lengths. Stuff the foam backer rod into the gaps.
- 3
  Measure the window's width. Transfer this measurement to a piece of pipe insulation. Cut the insulation with a scissors. Force the insulation between the bottom window sash's top edge and the upper window sash.
- 4
  Go outside. Apply a strip of clear vinyl tape over the gap where the window touches the top of the air conditioner.

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