Sometimes leaf tip turning black is due to over fertilizing. Brown tips sometimes means not enough or too much water. I don't think you are under watering.
You can help deflect direct sunlight by using sheers in the windows. If you are at higher elevations even morning sun may be too much for these plants without some kind of sun filter or shade.
Clay pots will keep the root zone cooler, but you should be careful to not allow the temps to exceed 80-85 for extended periods. The clay works when the pot is visibly damp on the outside. If it looks dry, then the plant isn't going to benefit from the cooling evaporative effect of clay. Your area is high desert and DRY! Do what you can to increase the amount of humidity in the air.
I have used a "mini greenhouse" sold by the big box stores with great success. I don't know if this is something you have space to house. You can create a micro humid environment in your dry area with one of these.
I have used a fogger to increase the humidity around my moisture loving plants.
Misting also cools the air and provides humidity.
There are a lot of creative ways to help provide a more amiable environment for your orchids.
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