I am beginning to have the opinion that this has kind of got out of hand.
If you are leaving your plants for a week, not a summer, not a month, a week, then how can they possibly develop any kind of serious problem in a week?? It makes no sense.
You mean that in just seven days, an issue can develop in 4-5 days of the week that can seriously damage their well being and over all health, and that issue can happen in just a few days??? That just seems out of line. Because if it was remotely true, you essentially made yourself a SLAVE to your plants!!! No fun, no joy, just a sense of impending doom and gloom. If that was remotely true, who would to be engaged in this hobby?? No one in their right mind, that’s who.
Now I know that a good many of us worry about our orchids but man oh man, that is just putting yourself under a lot of pressure. Just relax, take a few deep breaths and calm down.
No temporary greenhouse needed.
No plant sitter needed.
It is just 7 little bitty days. 7. Just make sure that they are hydrated upon your departure and trust that they will be fine.