What can you use to seal around a window air conditioner? 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.
What do you use to seal walls around air conditioning hose? As mentioned above, seal walls around an air conditioning hose using either waterproof silicone caulk or spray foam. Alternatively, it is also possible to trim around the hole with wood or shove a rag or other similar material into the hole.
How do you seal an air conditioner in the wall?
Can you use spray foam around AC lines? I personally would be absolutely fine with spray foam insulation on the ac lines. You’ll want space between the liquid and the suction line so foam is between them as much as possible. Also if there are any braze joints then measure where they are and go back and spray paint the foam to mark them.