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How to Seal an Air Conditioner Window Gap
- Jul 25, 2018 -

Most window air conditioners have an expanding curtain on either side to help seal any gaps between the window frame and the air conditioner, but sometimes this seal isn’t perfect. Even extremely small gaps can leak air, which reduces the efficiency of your air conditioner and may let bugs and dust into your home. There are several ways to seal these gaps, but the simplest method is to use adhesive-backed open-cell foam weatherstripping to fill the space and prevent air leakage. Smaller gaps can also be filled with a claylike material called rope caulk (acrylic silicone/acrylic sealant/silicone/sealant/adhesive/potting sealant/potting adhesive/potting compound/UV glue/Silicone sealant/Potting silicone sealant/Huitian adhesive/Huitian silicone/Huitian sealant/flange sealant/conductive sealant/Electrical sealant/electronic adhesive/epoxy sealant/epoxy adhesive/PU adhesive/gasker maker/thread locker/Thread adhesive).


Gaps Larger than 1/8 Inch

1

Clean the surface of the window and air conditioner around the gaps. Remove dirt, grease and dust to ensure proper adhesion of the weatherstripping.


2

Measure the length of the first gap. Cut a piece of adhesive-backed foam weatherstipping to this length.


3

Peel the paper backing off the cut strip of weatherstripping and position the seal, sticky side up, along the underside of the window frame.


4

Press the strip along the window frame to get a smooth, tight seal. Do not adhere the weatherstripping so that it rests in front of the gap. This will not seal it properly. The foam must be within the gap so that it expands to give an airtight seal.


Narrow or Hard-To-Reach Gaps

1

Measure the length of gaps that are 1/8 inch thick or smaller. Tear off a length of rope caulk to match. Rope caulk is similar to putty or modeling clay but is removable at the end of the cooling season when you remove your air conditioner.


2

Press the caulk into the gap. If the gap is deep, you may need to press two pieces into the gap to fill it completely.


3

Smooth the caulk (acrylic silicone/acrylic sealant/silicone/sealant/adhesive/potting sealant/potting adhesive/potting compound/UV glue/Silicone sealant/Potting silicone sealant/Huitian adhesive/Huitian silicone/Huitian sealant/flange sealant/conductive sealant/Electrical sealant/electronic adhesive/epoxy sealant/epoxy adhesive/PU adhesive/gasker maker/thread locker/Thread adhesive) and wipe away excess from the window frame and air conditioner with a dry cloth.


Things You Will Need

  • Tape measure

  • Adhesive-backed foam weatherstripping

  • Utility knife

  • Rope caulk (Silicone/silicone sealant/sealant/acrylic silicone/acrylic sealant/silicone/sealant/adhesive/potting sealant/potting adhesive/potting compound/UV glue/Silicone sealant/Potting silicone sealant/Huitian adhesive/Huitian silicone/Huitian sealant/flange sealant/conductive sealant/Electrical sealant/electronic adhesive/epoxy sealant/epoxy adhesive/PU adhesive/gasker maker/thread locker/Thread adhesive)

  • Cloth

Tips

  • Gaps larger than 1 inch should be filled with fiberglass insulation stuffed into the gap tightly.

  • In most types of windows, gaps are commonly found along the top, where the window meets the air conditioners, at the corners and along the bottom at the sill.

  • If the rope caulk is still clean and flexible when you remove your air conditioner, peel it off the window and store it in a sealed plastic bag for later use.


Source: homeguides.sfgate.com/seal-air-conditioner-window-gap-33397.html