yep whoever replaced the windows on my house for the previous owner used good windows and did a horrible job installing them. No caulking on the outside. No shims holding the windows in place just screws and sitting on the bottom jam. the gap was stuffed with fiberglass. then some trim stapled in to hide the roughly 3/4" gap around the sides and top. When it's windy you can feel the air moving past them.
As each room gets painted I've been pulling the trim and spray foaming the gaps then caulking the trim. The original windows installed in the 60's were better installed and probably as effective as these new ones.
A good installation is necessary to make new windows worth it.
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