I did mix them all throughout the house (my window style is a cottage 4-over-1 grid with both interior and exterior grids), and after all my fretting, no one would ever be able to tell from the inside or outside! (I even have to look and try to remember whether some of the casements are 100s or 400s.) If it weren't for needing some very specific sizes (and wood grids to stain in our den), I would do all 100's because I cannot tell the difference in terms of operation/quality on the casements and you can barely discern the difference in terms of looks. And even in rooms where I chose the 400 series because I wanted to have double-hung windows, I wouldn't do it again....as appealing as the notion of being able to open the upper or lower sash was, what I've found in day-to-day living is that I only ever open the bottom sash, so I would've been just fine with simply doing single-hungs! Overall I'm satisfied with my Anderson windows, but I like my friend's Marvin Integrity windows better than mine--hers operate better and just have more of a "quality" look (mine still look fine.....I was actually going to do Integrity originally, but they did a price-hike during construction, and I just couldn't justify the extra $15-20K).
I will say, however, that my Anderson 100 sliding windows that I did in the basement are ATROCIOUS in every way. Incredibly difficult to lock (you have to slam the window shut in order for the locking mechanism to "catch"--I far prefer the manual latches I had on my previous sliders), don't slide open very smoothly, let dirt in (we live in a very windy climate but still I've never seen so much fine dirt piled up on a window ceil!), super cheap--the lock plates have snapped or broken off over half of them in just the first year (and we almost never even use them). Needless to say, the inexpensive vinyl sliders we had in the basement of our last house were far superior.
Q
love those stones and overall storybook feel
Q