Thermopane Windows in Trailer

RVs do not come with thermopane windows. they come with dual pain windows. they are NOT the same as those in the house. do a search on problems with them fogging up. Had them in my second Class A , didn't order them in my third. a heavy drape works just as well and won't have the large $$$ fix up cost.
bumpy

I replaced the old jalousie windows with Low-e sliders. One of the best things I did for restoring the old Starcraft. No condensation, lower heat loss, and it is quiet as a tomb inside. They should be OEM for every RV, IMO.

Yes dual panes can work. I had removable storm windows that were cut the same size as the OEM window frames and held I place with clips. They were warm in winter and quiet. They really cut down the noise from passing snowmobiles when I was camped right on the trail.

If they (dual pane options) are pop out windows, they tend to allow less air in than slide windows during the summer to circulate cross ventilation. Some people use the A/C to offset that which is fine if that works for you.

If the optional dual pane windows are frameless, I would research it. Some people have negative things to say about them.
I am making my own storms for my new TT only because I do not use my A/C because I boondock w/o hookups and I need as much air circulation as possible.

The thermopane windows in your house are also just two panes of glass.........

The help to cut down the noise in noisy RV parks or when at RV parks near freeways, they help keep the heat out and the help keep the cold out. I wouldn't buy a rig without them.

Bill