Andersens woodwright do have more of a wood interior. The structural performance is higher on the original 400 series TW where as the woodwrights will let more air through. So if you want the looks, get woodwright. If you want better performance, get the other. Also the exteriors of the sashes are not perma shield vinyl cladding. Good luck

The reasoning behind this is the manufacturer doesn't make a good DH unit. The vinyl DH's need to be better built and stronger than the others. Anytime you have two fully functional sashes you require a more precise installation with more patience. The Single Hungs are just cheaper to make and easier to hang. Almost idiot proof in most cases. They are also more energy efficient from air infiltration becuase a lot of installers don't take the time to shim the DH unit properly. They end up leaking around the sashes, creating that ever so hated call back. With a stationary top sash they don't have to worry about anything leaking around the upper sash. The downfall of the SH is you can't tilt the sash in for cleaning. This can be quite trouble some for the windows off the ground a ways. There are ways around that for cleaning if shown the proper way. The history of the DH window goes back to the old farm houses that never had AC or Central Air. They would pull the top sash down about six inches and the lower sash up about six inches. This would let the air circulate better in each room by creating the drafting affect (Firefighters call it breathing during a house fire). With todays AC in almost every house the DH windows aren't really required for the drafting situation. You can still get them from almost every dealer. If they are balking at DH's with reasoning like they gave you. I would steer clear of them and start shopping for another supplier. Hope this makes sense to you. God Luck!!!

I am not sure what a jamb liner is. Back of where the bottom window fits, the wood that comes out between top and bottom windows has aluminum edging. I don't see a name on the hardware or glass. There is no between the glass. This is single paned glass double hung window with pressure fitted screens and storms. The house was built in the fifties.

OP here, sorry it was meant to read "big gap between the window and the wall." That part is now much better (last time he had some assistants who did some of the work), but the outside still looks ridiculous. I'm just trying to figure out if there is some technical reason that a double hung might frame out on the exterior differently than a casement window. The installer kept telling me that this was the case. If that's true, okay, I wish someone had told me in advance though.