Let's break down the process a bit.
Moving plants out and in again does them no harm (unless you drop them!). In fact, if your conditions are not the brightest, and your overall air movement isn't all that great, doing so might give the plants an added boost.
However, moving plants top a suddenly different set of conditions needs to be done in a controlled fashion, and you're going to need to compensate for the changes. For example:
- The light intensity outside is a LOT stronger than it is coming through a window, especially with the high angle the sun reaches in the summer, causing it to reflect off of the glass more than go through it. That means the plants need to be transitioned to the higher light levels.
- Consider if your plants like higher temperatures. Phals will thrive, some cymbidiums will too, but pleurothallids will croak.
- It's probably wise not to move plants in bud or bloom, as a sudden change in temperature or humidity can shock them.
- Have you considered how you will manage the watering and feeding regimen? If the conditions are generally warmer, water will evaporate faster, and the plants will likely be growing faster as well, so more feeding and watering should follow. Increased buoyancy of the air will also drive faster drying.
- Conversely, what will you do if you get into a "monsoon" situation? Is your potting medium airy enough to withstand a week or more of saturation without suffocating the roots?
- Are the plants stable and well-anchored? Way too many plants become knocked over or dislodged by breezes, storms, birds and squirrels. Can you say "broken flower spike"?
- Speaking of pests...how are you going to control bugs? A lot of folks only think about them when it's time to move the plants back inside. A LOT of damage can occur while outside.
I'm sure I've missed a few "gotcha's", but I think you get my drift.
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