Sounds great to me... in a week, nothing is going to grow a whole lot (orchids grow very slowly) And the extra moisture from the moss won't hurt anything in that short time either. (If they were soggy for a month it would be an area of concern but for only a week, making sure everybody stays hydrated is far more important than worrying about anything staying too wet)
If you have central air and can control the temp I recommend cooling it down a bit too. Normally when I'm at home I let the temp get to mid to upper 70s during the day. When I travel I actually set it cooler like 65 to 68.
Of course I live in a small apartment and the cost isn't that great, but I feel it helps.