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Weather proof a window after A/C Window Installation?

• Weather proof a window after A/C Window Installation? The house I live in has windows that can be 'removed', I don't know what these windows are called, basically it looks like a normal window but the half that you move up and down has 'tabs' that you can slide out and remove the whole section of the window. Not really a problem unless you are not careful opening and closing a window there is a gap between upper window and bottom window. That is the issue I'm having. When I install the A/C window unit I of course have to raise the lower part up and put the window unit in. There is a remarkable gap between where the window is raise and the upper window as not 'flush against' the upper window when raised. What can I do to close that gap off, its about an inch, inch and a half. I have tried weatherization products like 'vinyl seals' but they wear off after awhile and also a piece of 'foam' that Duck Brand sells to put in the gap but that doesn't stay/fill the gaps, a simple lighter to the window flickers wildly still. Any thoughts or tips would be appreciated.

• Answer:

  You can find a piece of foam insulation designed just for this at the local hardware store. Usually a piece 3/4 of an inch wide is plenty, but in your case I'd find the 2"x2". Alternatively, pipe insulation might fit this gap. If you still have some air coming in, try vinyl tape.