hee hee....my 3-seasons room has sort of evolved and taken on a life of it's own. When I first designed this house, there was going to be a deck off the diningroom, and a deck off the master, both at the back of the house. I was going to put a water garden between them. then I changed it to 2 screened porches. Then I changed it to one large screen porch, 47' long and 14' wide. Then I changed it to double-hung windows instead of screens (now it's turning into a 3 seasons room). It was supposed to be unheated...but we have since decided to add a nice fireplace and an window air-conditioner so it can be a 4-seasons room. Since it's heat and air are independent of the rest of the house, I can leave the windows open for most of the year and enjoy the sounds of nature, but I can easily close them and make the temperature comfortable on the hottest and coldest days. This room is going to be everyone's favorite beause of the view. There is a huge, double opening french door between the dining room and the sun room so for big family dinners we can just open the doors and make the two areas feel like one big area. I LOVE this design!!

A few years back we added a 14 x 22 foot room. Used Pella casement style windows with the window crank for opening. Widows have worked great. Room used year round here in southwestern Virginia.

I think Windows on Washington is on the right track as usual. Monray is not cheap and this could probably be done for the same price or cheaper with a nice vinyl double hung With insulated glass and low-E . This would allow it to be a true 3 season porch in Mn. And the LowE would prevent overheating On warmer days, a little heater may even extend it year round. I would look at Larsons Higher end storms as well sonde they are pretty nice and typically much cheaper than Monray. The fact that Monray does custom sizes is nothing special as this is the norm with most window manufacturers.

The wood casements' I know of leak water. .. in new and replacement models... Stick with triple pane standard function up and down window. Get the highest quality screen you can. You can get the ones that open both, down from the top or up, from the bottom if you desire, but generally you may need this option only on a few to allow for fresh air in spring rain seasons, or warm air ventilation in the late summer, in absence of a/c. So you could pick 2 or like that which would allow cross ventilation, if the budget is consideration... Also, if you ever want to add a window unit ac/heater combination casements will not work in that manner. Also, you live near the woods. I would avoid wood windows. For the same reason everyone was so thrilled to buy aluminum windows when they first came out, in the 60's. The wood frames of any style/brand... will NOT retain enough moisture to avoid cracking in low temps or swelling in high humidity, in short order, (Termites could swarm and do damage also--same as interior wood flooring/wood siding) and these are the high end windows, in new construction experiences of neighbors--the dry and cracking and swelling, especially if they are not sheltered by an effective porch roof, and they will require maintenance such as staining or painting, regularly..and the handles seem to have mere plastic gears that are not going to stand the test of time on the casement styles if they are used regularly...... The vinyl clad wood are going to give you issues too in time, they are vinyl..it will crack, peel and fade in UV light rays, in time.. The best ones, longest lasting, will be the aluminum windows in white or brown or black or your choice of colors.. Make certain that insulation is added around the perimeter when they are installed! and Caulked well. Make certain the windows are attached with screws to the home structure, not just "caulked' in place(it happens IDK why?????)when they are installed. Document the installation. Keep all warranty papers. Don't bother with the divided light option..any overhang you might have will add to the life length of windows. On another note, consider adding a faux marble window sill on the inside, and be sure again, that caulking is done well, exterior and interior. Also, go ahead and have the company you deal with promise to come and check the caulk and functioning of the windows they install after the 90 day or 180 day timeframe to make sure they are functioning well, and if you need them sooner, that they will come. TIP: If they are difficult to lock, open, close, or use in any way after they are installed, NO, they will not improve with use. They may have been twisted when mounted, or they may be don't work from the factory? for whatever reason. Make sure to hasten their replacement, don't live with it till you have no recourse but to spend money to fix an annoying issue. Just like anything, there are good companys, and bad installations, there are manufacturer defects and experienced quality installation. Hold off the final payment till you are completely satisfied that they are all in good working order and protect your room from the exterior elements.