Perhaps adding some salt or salty water in a small percentage (not too much) to the leaves will help.
By adding salt you raise the osmotic levels which 'pulls' the water towards itself. That way you reduce the vaporization in the leaves.
Would that not draw water out of the leaves, as the osmotic levels outside the cells will be higher than the levels inside?
Ahh, okay, I now see my mistake. Forgot about the cellmembrane being semi-permeable..
So, then watering with destilled water is what we want since it tugescents the vacuole, right?
Thanks for explaining.
One last question; if you stop/reduce gas exchange, wouldn't the photosynthesis stop too since CO2 is required?