Leaving my orchids unattended... help!

[OrchidEye]

Hello!

Unfortunately in about two weeks i'm going on vacation and have no one to take care of my orchids while i'm gone. I'm going to be gone for about a week and am worried about them because of the summer heat.

I have 8 orchids; 4 Phalaenopsis, an oncidium, and 3 dendrobiums. I keep them in two different windows of my apartment which they seem to get the perfect amount of sun. During the summer i have been watering them about once every 4-5 days depending on the weather. I also have rock trays underneath them that I usually keep filled with water to keep the humidity up for them. They usually dry out almost every other day.

Any ideas for me how I can keep my plants moist and happy while i'm gone?

Thanks!!!