I don't have any direct experience with your situation re: sunroom, but have a couple observations for you to mull over. Last year I purchased some replacement windows - P*ll* brand - they are double-pane, low-e/argon gas. It was a waste of $$ since this last winter I actually (first time ever) had FROST buildup in those windows worse than when I lived in a trailer (ie, no insulation, poor seals, etc). These were mid-range windows; not top of the line, not budget cheapos. Beware the hype or get iron-clad guarantees. Now a comment about your questions. I believe there is a formula for window-to-room ratio for sunny climes like yours. You can do that, or if you really want more glass, think about a shade cover that you can use inside/outside during the sunny season. Yes, putting it up/taking it down might be a pain, but it will work. An 80% shade cloth on the inside might keep things cool enough - but like I said, I have no direct experience with this, just a stray thought.

Thanks everyone. I know it seems great to have all these windows and I am definitely not complaining, but we realize we could have had almost the same effect and light with 8 instead of 10 - and saved a lot of money (in cost of windows and framing) but the architect shows you the drawings and you think wow, that looks good, and you don't think about whether or not it will be practical in use. Our architect came up with that to remedy an really unfortunate addition done by former owner. They stuck on a weirdly designed very 1980's round addition to a 1920's Dutch Colonial - but in a completely different style from original and tried to make it look somewhat like a lighthouse. From the outside, it just looked like a big round mass of stucco, now it looks much better. But I digress... Anyway, that's a good idea about the remote control shades/blinds. Do you know if they work well over time. I like technology, but just want to make sure they are not repair prone. I guess I can search and see if there are any threads about that.

Hi when buying windows check the contract details very carefully! Some guarantees diminish with time and are relatively poor value. Highly expensive windows would indicate quality, but I have seen very expensive windows that are just plain average quality and when installed, have not been fit correctly. If it's plastic you are after check the extruded section sizes (larger are normally better). Check for thermal breaks in the window frame sections. Check the type of locks and catches for integrity. Do they use an espagnolette locking system with shoot bolts or simple espagnolette system. Are the fitting stainless steel or just coated mild steel. Check the sealed units in the frames are going to give you the best U value performance. A U value is, a numerical value indicating the transmittance of heat from inside to the outside. The lower the U value the less heat loss, so saving you money in the long term. A good performing window can cost a lot less over it's life than a poor performing window. Price may play a part but the quality of the window and correctness of fitting are what is important. It's a very competitive market so get quotes, check contracts and window specifications and make an informed decision.

You will probably be able to use an insert window which will save a lot of the installation costs without losing too much glass area. Just decide as to the frame material: wood, fiberglass or vinyl. I agree with WOW with the use of SDL. Sounds like what you have now is ADL or authentic divided lites.