Help with sunny windows and humidity trays!

[NYCorchidman]

Now that I moved to a new place with south facing windows, I am facing some new issues.
One of the first things I did within the first couple of days was to put up a sheer curtain so that my orchids would not get sunburned. I actually shopped around a few places looking for proper sheer curtains weeks before moving. All I could find was the type that would block way too much light. I almost gave up.
Then I went to IKEA to get some book shelves, and alas! I found a perfect sheer curtain for my windows. super happy and relieved!

Now the main problems are high temperature and low humidity. It is still March but with the windows closed with so much light during the day, the air gets heated quite a bit reaching up to 85 already! and thus low humidity around 40.

I am thinking of getting a small fan when the weather gets hotter and hotter, but not so sure about what to do with the low humidity.
I thought about getting a humidity tray, but read somewhere that it doesn't really do much as far as increasing humidity is concerned.

So I would like to know if anyone with hot south windows ever tried humidity trays and if they seemed to work? i.e. orchids growing and flowering nicely due to the use of humidity trays as compared to plants performance when humidity trays were not used in bright hot dry window setting.

Many thanks in advance!