Beautiful orchids!
I desperately want a greenhouse, but alas I also grow in my windowsills and under lights because my back yard is too small for even the tiniest of greenhouses. In the spring through the fall, I move as many plants outside as I can, but the Dallas summer heat is too much for many of my orchids. In the winter they all come inside, which forces me to keep my collection in check (dang it!).
From what I can see in your other post, it seems that your windowsill set up is working great. Your plants appear to be very well-grown. And I like how you have the shelving set up. I might have to steal that idea and work on a similar set up.