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How to Seal the Outside of a Window Air Conditioner That Is Mounted in a Double-Paned Window
- Aug 16, 2018 -

Window air conditioners are an affordable option for home cooling. However, it is important to properly seal them to avoid energy loss. Gaps around an unsealed air conditioning unit will allow heat and bugs into the room. Double-paned windows are well insulated because of the space between the panes of glass. Therefore, if you take the time to seal around the unit, you will have an efficient cooling system for the room where the unit is located.


Ask a helper to hold the air conditioner unit in place while you raise the bottom window sash up enough so that you can access the bottom edge.


2

Position the end of the weatherstripping at one end of the bottom edge of the bottom sash. Unroll the weatherstripping and press it into place along the entire length of the bottom edge of the sash.


3

Cut the weatherstripping flush with the end of the sash using a utility knife. Lower the bottom sash back down into place against the air conditioner unit. Your helper can now stop holding onto the unit.


4

Extend the extensions on each side of the unit so that the ends are tight against the sides of the window opening.


5

Stand on the exterior of the window. Cut off the tip of the caulk tube (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) with the built-in cutter on the caulk gun. Puncture the seal inside the tip with the seal-puncture tool on the caulk gun. Insert the tube of caulk tip first into the caulk gun.


6

Apply a bead of window and door caulk around the perimeter of the seam where the air conditioner unit joins with the window opening.


Things You Will Need

  • Weatherstripping foam

  • Utility knife

  • Window and door 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)

  • Caulk gun

Tip

  • Inspect the caulk seal and weatherstripping yearly, if you leave the unit permanently installed year-round.