Even in your garden window, the humidity isn't going to be all that great in winter, especially if you hang your orchids up near the top. The other plants wouldn't need nearly as much watering as Phals hanging on a mount.
I'd go for a big clay pot, and keep a spray bottle handy so you can mist them whenever you walk by . . . a little dilute fert in the spray bottle will be welcome, too.
I have a couple of Phals on a mount outside, in the sauna that is Florida in summer, and I still water them with a douse from the watering can at least every second day if it doesn't rain. They dry out very quickly! Orchids are 'designed' to absorb moisture and nutrients from the air so they eat up water that sits on them mighty quick.
