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Vinyl window replacements can range from $400-$600 depending on the brand. Capping the windows can be an additional charge.
If you go with a Lowen, Norwood, or Lincoln wood window you could be spending north of $1,500-$2,000/window.
Anderson & Pella wood windows with aluminum cladding can be in the $700-$1000 per window range.
Michael's numbers are correct, keeping in mind "start at" and that is for the window itself and does not also include a high quality professional installation, spray foam insulation, high quality caulking job, custom exterior cladding, etc. Installed - if you are getting a quality window from a professional window installation company that does't cut any corners and provides lifetime warranties on the product and workmanship and warranties on the glass breakage, etc - vinyl can range anywhere from $700-1,500 and fiberglass/wood clad $1,200-$2,500 depending on the features and add ons. Big box stores, subs, builders, etc would be a lower price point but you would not get the quality most people are looking for with a replacement project on the windows, workmanship, or warranty. Hope this helps.
Its sounds like you have a double hung window that slides up and down check to see if the outer top window can slide up then lock it. If the glass is sperating from the frame you can take it to a glass replacement company and they will fix the frame and glass if not vinyl welded
Here is an interesting take on the situation that I got out of the real estate section of the New York Times.http://www.nytimes.com/2003/03/23/realestate/your-home-eliminating-wasps-and-their-nests.html?pagewanted=all
Depending on the type of soffit/eave vents, it would be easiest and most cost effective to replace them with a new vent that has smaller screen material. Most of those can be found at a local supply store.
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