phal - central heating tolerance

[chemist]

Hello dear OT members! Your advice is needed!
Since I acquired more orchids I'm thinking now to make a shelf for them or maybe it will be for other plants if place I chosen wont be good for them and I need your advice where to position shelves.
I have east faced window so I was thinking to make shelves on that window. But here I have questions:
1. Under windows on floor I have a central air radiator… If I’ll build the lower shelf 24 in (or 36 in etc.) above the radiator (see pics) will Phals tolerate it or not? In the summer of course it does not matter but here in Long Island, NY we run heat from maybe October till April-May (I’m not sure, depends on weather).
2. Will it tolerate morning sun? Now in summer average room temperature (in shade, in the spot where orchids are) 80-85F (25-30C) but when I put thermometer on windowsill on sunny spot temperature went up till 95F (35C) and humidity from about 60% (on the spot close to humidity tray) went down to 40% (with no humidity trays around). Is it too much? Of course I can shade the window with blinds but I leave for work at 7:30 am it means if I don’t open blinds there will be no sun all day. And if I open at 7:30 I’m afraid to burn orchids since leaves getting pretty warm when on direct sun.

Other possibilities:
A) To put shelves on a wall across that window but it will be 8 feet away. Is it will be enough light for phals? I don’t have device to measure foot candles, but per “orchid guy” tip I have light shadow from my hand one foot away from wall, according to him it should be enough for phals.
B) To make shelves on west faced window (kitchen), the only one which does not have radiator under it, but I have dining table next to it (I have small apartment so its eat-in-kitchen). In this option I have a tree blocking the sunlight (the tree about two yards away from window) and I have direct sun only when sun in North-West position (I guess tree won’t be a problem during winter time when there is no foliage)
C) I do have south faced window but then I will need to make shelf on the wall going from the window toward the inside of the room (from 0 to 5 feet away from window). That window is under roof so light is not that bright all day long and central heating is fairly far from that wall.

So dear experts, what would you suggest?!
Thank you!