Sure it is! You can grow hoyas anywhere, that's the beauty of them :)

I don't know what the actual humidity level should be (percentage-wise), but I just put pebble trays under all my hoyas and keep them filled with water. Just make sure the pot isn't sitting in the water. You could also use a humidifier to add moisture.

HTH,
Gabi

OK....just found a picture showing some of my hoyas on pebble trays. I just use those plastic saucers they sell in garden centers (they are very cheap) and I fill them about halfway with pebbles. Just make sure to always have water in them since it's so dry where you live. Here's what they look like (sorry that I don't have a close-up):

That's probably not a bad idea, but I only have pebble trays under a couple of my Hoyas. Most are fine with regular household humidity. If the level of humidity feels good to you, it's enough for Hoyas. We have a humidifier on our furnace that keeps the humidity at a relatively comfortable level, and that seems to be plenty for my Hoyas. Of course, I do grow a lot of plants, so there's something to be said for the "micro-environment" that's created with a lot of plants being grown together.

Years ago, I tried running a humidifer to supplement the humidity around my plants and found that it caused more problems than it resolved.

Denise in Omaha