I have a question about replacement windows...over the summer I had all my windows replaced with brand new "replacement" windows, not "new build" windows. Yesterday was a very windy day(65mph) and with the windows shut and locked, I could feel cold air blowing in from the sides, where the 2 sashes come together along the tracks on the wall that they slide up/down on(follow me?) I know when they were installed, there was insulation stuffed in the gaps before the finishing boards were put on.. anyway, my question is, does every/any window always have some amount of air leakage? Thanks for any input. CG in NY