> I keep my bird on the balcony which has glass doors so its separated
> from the outside now that the winter set in.. There is no heating out
> there but the temperature doesnt go below 10 degrees celsius.. Is this
> still cold for Kiki or should he be fine ? What is the lowest
> temperature in which nandays can be kept without risk ?
Nandays are temperate zone birds, and fairly hardy, so brief exposures to the temperatures you describe shouldn't harm them. however, from my observations of their activity, nandays are most comfortable at the temperatures that humans are most comfortable at -- that is, about 18-25 degrees. You wouldn't be comfortable living at 10 C. overnight, and neither is your bird.
But, academic questions aside, you are putting your bird at risk. Please move your bird someplace warmer.