Vinyl windows are generally mulled to together using a vinyl h mullion. simply a piece of vinyl the depth of the window frame with legs on each end to form the shape of an h. Generally this is an easy mull, the flanges would eb carefully cut of the the h mull strip would be place on one side of the window with a bed of caulk the other window positioned next to it and then the 2 units careful screwed together. When screwing them together be careful not to pierce anything important. When you install make certain to use a drip cap over the top a preferable some sort of panning system on the bottom of the opening.

Neglected to mention that these are double hung 4 over 1 windows to replicate my original existing windows. There's also the unsightly gap between the "new" sill and the existing sill upon which it rests - it happens when the existing sill is not the same angle as the 8ÃÂ ordered (By the way there are only three options available 0ÃÂ, 8ÃÂ & 14ÃÂ) No instructional information has been provided on how to address the sill gap issue in videos or instructions. And of course the sample display window doesn't have that problem..... Will I ever get a good night's sleep again ;-)

What does your contract say about the installation details? This is what some would call an "express" install. Full frame of old window removed, new window sized the same as old, then bumps against the back side of the jamb/drywall return. Its not the most comprehensive installation, but its generally accepted when done correctly. There are 3 concerns that I have with your specific install: 1) This type of install is typically done when the depth of the new window is not greater than the window coming out. If it is, it sticks out like this which most people don't like (this applies in your case). Most guys would have downsized the window to fit within the jamb return so that it could slide in further to the interior OR do a true new construction install with nail fin, which would have required ripping down or replacing the jamb extensions. This does not qualify your installation as completely wrong and needing a full redo, but I'd check the contract details. If something else was specified it may be worth pursuing, otherwise it will probably need to remain as is. 2) Caulking of siding to the trim. If this is wood or metal siding and not vinyl, this isn't much of an issue. If vinyl, caulking the siding to the trim is going to be repeated maintenance for you. Vinyl siding moves, it isn't nailed tight like the windows. If you have siding issues (bowing, buckling, etc) it will likely be due to the siding panels being locked in place by the caulk. This is typically more common on the south and west sides that get a lot of sun. Sometimes this doesn't cause any problems, other times it does. 3) Last concern and significant enough to look for correction IMO: The caulk across the top from the siding to the trim. Moisture gets behind vinyl siding and needs an exit point, this is the purpose of the drip cap/ head flashing. As Todd alluded to, when that exit point is blocked, the water has to go somewhere. Unless they did something creative and unconventional to address that, I'd look for that to be fixed.

I live in Hardiness Zone 5 (Michigan).. here's my review after 2 years of having the EnergySvr Window Inserts from windowinserts.com . Reality is, if you have NOT owned them, you don't know. I was skeptical at first.. but 2 years later.. This is my review for Window Inserts. This review is being provided as my own, I was not given any special pricing, free product, or any other incentives for providing it. ** Short Version – I WHOLEHEARTEDLY RECOMMEND THESE WINDOWS AND COMPANY ** I originally purchased my window inserts in 2019 for use in a rebuilt 3 season room. The room itself has 6 openings, all of different sizes. There are NO traditional windows in the room, and the only “window treatment” is the old style framed screens that I built myself. I spent a LOT of time looking for a way to close the openings off at the best price and easiest way for me to do them. I am a disabled veteran with severe back issues, the 3 season room holds my hot tub, so condensation and heat transfer where a big concern with this project. I spoke with at least 3 or 4 other places, and received quotes for the “inserts” ranging anywhere from 3 to 12 times as much as the quote from Window Inserts. The two big cost reasons where the types of material used, and that the openings where irregular sized. Two of them actually have top and bottom widths that are different from their opposing ends, by as little as 1/8”. Upon my first call, the owner of the company took my call, answered all of my questions, and gave me an estimated price for the windows, which may have gone up or down depending on shipping costs and final opening sizes. Again, this quote was vastly lower than any other “insert” style manufacturer I was able to find. One of these reasons, is the material that Window Inserts uses to make the transparent part of the window itself. The owner assured me that the material was durable enough, and would provide good protection from the Michigan winter cold and winds. The windows are rated for a sustained 30mph wind, or gusts up to 40. For us in Michigan, that’s a typical winter Tuesday. So, I placed the order since the price was, frankly, too good NOT to place an order, and the service was AMAZING. I think we did 2 or 3 size checks because *I* wanted to make sure they where right on my end. The windows, if your ordering multiple, come numbered so that you will always get the right insert into the right window. Also, the company keeps your order in their computer, so if you need to reorder just one window, they can pull up the order and sizes from the system, and save a bunch of time. The windows do have a warranty, and the company definitely stands behind it. I received the windows about 10 days after ordering them, and was floored. The transparent material was SOOO thin I didn’t see or think it was going to hold up, let alone help with any type of heat loss. Well, 2 pretty harsh and windy Michigan Winters later, and I can tell you without hesitation that they not only perform, they held up so much better than I ever expected. High winds.. check. Rain.. check.. Blizzard.. check. I even wanted to test to see exactly how much they made a difference so I got an external digital thermometer. The average heat retention in the 3 season room is between 22 and 32 degrees WARMER than it is outside. That is with the hot tub CLOSED and no extra heat from any other sources. With the hot tub open, the 3 season room routinely breaks 80 degrees in the dead of winter. Remember, there’s NO GLASS in my 3 season room.. it’s mother nature, a screen window, and then Window Inserts. During our winters, we routinely get 30+ mph winds, and these window inserts have held up in their open 51” x 55” frames without fail. 40+ mph.. they still hold.. 50+, yup.. still holding. It took a 62mph gust to blow ONE of the six windows in. The other 5 remained in place without any sort of modification or additional holding devices, materials, etc. In the winter months, the outside frame of the window is sealed with foam insulation. This foam flexes to fit your openings, and I’ve found that when it’s freezing outside, it causes that foam to freeze in place. That thin little layer of ice actually holds the windows in when it get’s overly windy outside. When it thaws out, the foam absorbs the water and then dries naturally, so you also don’t get any running water over the sills nor any odd smells. I would not expect this “foam freeze” if you put them inside of your house windows. As far as the warranty goes.. well.. on this one I failed a bit. I forgot that they do infact cover the foam, and if you need replacement foam, you simply call them and they’ll send you some for free to replace any damaged foam. These windows are incredibly light, my initial package weighed less than 20# for all 6 windows. The frames and corners have NEVER failed me, and the only damage that was done was after I dropped a window and bent the frame on the edge of my hot tub. This was actually a fluke, and totally my fault. The owner of the company was quick to answer the call and gave me a great deal on a replacement window, including making it, and another, in their new divided style, which I’m looking forward to putting in. Even with the recent issues in shipping and manufacturing, this order was just as fast, and I received my new window inserts in 8 days from my order. 8 Calendar Days.. not business days. In an age when customer service, honest pricing, warranty coverage, and an amazing product are getting harder to find, almost by the day, Window Inserts ticks the boxes on all four. The product is absolutely amazing in my opinion, and I HIGHLY RECOMMEND them to anyone looking for an insert to help retain heat in your house or 3 season room.