We had Alside install all the windows upstairs in our home two years ago. All of the windows are tight, including the Bow window, except the two four foot long windows in the bedrooms facing the Northwest. These windows leak when the wind blows. A technician came out a year ago, & said to remove the window wood mouldings & stuff in fiberglass insulation, & that will do the trick. Did that last summer & it did not work. Called Alside main office & this past December, their District Manager came out & told me my "Expectations" were too high & all windows leak in cold air. So I asked, why doesn't the other Alside windows do this, only these two four foot long windows? He didn't know. So, he agreed to have the local Harrisburg, PA. office call me to replace just the upper sash in each window & that should help. So far, no one ever called. Meanwhile to keep the cold air out of my two bedrooms, I has to use fingertip rope caulk & tape the sashes where they join & where the sashes meet the frames, which is a lot of caulk. We are going to call this manager back this week, & if he contimues to delay, I am hiring an Attorney. Can you imagine Alside being in the roofing business & you have a few leaks? They would say your "Expectations" are too high since all roofs leak after a roofing job. Barry in PA.