How do I prevent condensation on my balcony windows?
You're dealing with a basic fact of nature, water condenses on cold objects, so you need to either remove the water or the cold objects. The windows will typically be the coldest objects in your home since they have such a low R value.

Start by reducing the humidity in your home, run exhaust fans in the kitchen and bathroom for longer when cooking and showering to remove the moist air. You can also install a dehumidifier to dry out the air.

The second step is to make the windows warmer by upgrading them to double paned insulated windows. If your windows are old, this can also save you money with lower heating and cooling bills.