I grow my Phals in the house with 32% to 40% max humidity and they do fine with many roots and good leaves. So I doubt the house environment is really the problem. It could be they need re-potting or don't like the mix or pot type you use. I see your one is in a large clay pot. I know the clay is heavy and helps prevent them from tipping over. But Phal roots can photosynthesize and really like clear pots. I use a mix of medium bark and sphagnum moss. The moss helps retain a bit of moisture and the bark keeps it chunky and allows air pockets as the roots need to breath. Plastic pots don't dry out quite as fast as clay either. Your pot also looks pretty big for that plant, although if they are being dried out thoroughly before re-watering, it might be OK.
You could try putting a humidity tray under and use the water that runs thru from watering as your humidity water. Never let the pots sit in the water in the tray tho. They must be above it or they will wick up water.
Another thing you could try if not doing it already is to use some kelp (seaweed) occasionally in your fertilizer water. This really induces root growth and I see a big improvement using it.
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